S’mores Whoopie Pies

S’mores Whoopie Pies have been one of those treats that brings me straight back to backyard evenings and sticky fingers, and the first sentence here is exactly where that memory begins. I remember teaching a niece how to sandwich a pillowy filling between two graham flavored cakes while we traded stories, and the laugh when a stray smear of ganache landed on her nose made the whole night sweeter.

Over the years I have tweaked the balance between the crunchy chocolate coating and the marshmallow center until the texture sings in harmony. I like to think of S’mores Whoopie Pies as a grown up take on a childhood campfire classic, with a soft cake that still manages to hold up under generous fillings. When I bake them I pay attention to small things like how the batter looks when it falls from the spoon, or how the ganache glistens as it cools.

These treats are also a showstopper for gatherings, because they assemble quickly after the components are ready, and everyone gets to watch the final pairing of chocolate and marshmallow. On the rare night I make a double batch, I notice a different kind of joy in the kitchen, because friends swap assembly tips and someone always offers a creative tweak. That supportive, hands-on vibe is why I keep this recipe in my regular rotation.

Ingredients Overview for S’mores Whoopie Pies

For me, the philosophy behind these ingredients is about layering familiar s’mores elements into three cohesive components: the graham flavored cakes, the rich chocolate ganache, and the fluffy marshmallow filling. The key players are the graham flour and all purpose flour that give structure, the fats like unsalted butter and vegetable shortening that create tenderness, and the trio of chocolate, heavy cream, and Marshmallow Fluff that deliver the classic s’mores flavors in a sandwich format.

• 1 1/2 cup graham flour (180 g): Provide a lightly sweet, slightly nutty graham flavor and tender crumb to the cakes, contributing authentic s'mores character and subtle caramel notes. Replace part of the flour blend to maintain structure while giving a distinctive cracker-like taste. Use measured scoops to preserve texture and color.
• 3/4 cup (93.75 g) all-purpose flour: Add gluten and structure to the batter, helping the whoopie pies hold their shape and provide a soft, cakey crumb when combined with the graham flour. Balance texture by controlling the total flour weight to avoid toughness. Sift or whisk with other dry ingredients for even distribution.
• 1 1/2 teaspoon baking powder (1.5 teaspoons): Leaven the cakes by producing carbon dioxide when heated, promoting lift and a light, cake-like texture in the whoopie pies. Reacts with liquids and acids to create pockets of air, so distribute evenly among dry ingredients. Measure precisely to prevent over- or under-rising.
• 1/2 teaspoon (0.5 teaspoon) salt: Enhance overall flavor balance and strengthen gluten formation slightly while moderating saltiness across the batter. Help regulate yeast or chemical leavening interactions and improve mouthfeel. Dissolve or mix uniformly into dry ingredients to avoid concentrated salty spots.
• 4 tablespoons unsalted butter, at room temperature: Contribute richness, moisture, and flavor while creating an emulsion that helps trap air during creaming for lighter cakes. Soften to room temperature to ensure smooth creaming with sugars, enabling better volume and uniform texture. Avoid overheating which can alter the batter's consistency.
• 4 tablespoons vegetable shortening: Stabilize the fat blend and add tenderness while contributing a softer texture to the whoopie pies, especially at room temperature. Combine with butter to create a workable shortening–butter mix that improves spread and structure. Use measured amounts to maintain the intended mouthfeel.
• 1 cup (220 g) packed dark brown sugar: Provide moistness, deep caramel and molasses notes, and sweetness that enrich the flavor and color of the cakes. Pack firmly to ensure consistent sweetness and humidity in the batter, which affects crumb and chewiness. Cream well with fats to dissolve and aerate the mixture.
• 2 large eggs: Bind the batter, add moisture, color, and structure, and help with leavening through steam and protein setting during baking. Bring to room temperature for even incorporation and to prevent batter from curdling. Beat in thoroughly to distribute proteins and fats uniformly.
• 1/2 cup (120 ml) buttermilk: Add acidity and a tender crumb while balancing liquid content and contributing to chemical reactions with baking soda. Temper the buttermilk if chilled to avoid seizing fats and to promote even mixing. Measure accurately to maintain batter consistency and flavor.
• 2 tablespoons milk: Adjust the batter's consistency and add a touch of extra moisture, helping the dry ingredients hydrate and yielding a softer cake. Use as needed to fine-tune batter viscosity for proper piping or scooping. Warm slightly if cold to blend smoothly into the mixture.
• 1 teaspoon baking soda: Provide quick leavening when combined with an acid, producing carbon dioxide that lightens the texture and gives a gentle rise to the cakes. Dissolve into wet ingredients or mix into dry components for even action. Pair with vinegar or buttermilk for optimal effect.
• 1 teaspoon white vinegar: React with baking soda to produce carbon dioxide and enhance the rise and tenderness of the whoopie pies, creating a softer crumb and slight lift. Add to wet ingredients to ensure full activation and even distribution. Measure precisely to avoid metallic or soapy tastes.
• 1 teaspoon vanilla extract: Impart warm, aromatic notes and enhance the overall flavor profile of both the cakes and filling with a familiar sweet vanilla character. Use pure extract for more depth, adding at the end of mixing to preserve volatile aromatics. Small variations change flavor balance noticeably.
• 1 1/2 cup Marshmallow Fluff (190.5 g), or other prepared marshmallow cream, which will do in a pinch: Provide a fluffy, sweet marshmallow center with creamy texture and classic s'mores sweetness, functioning as the sandwich filling. Spread easily between cake rounds and stabilizes the sandwich structure, adding both chew and lightness. Use as-is or whip slightly for a lighter finish.
• 1 1/4 cup vegetable shortening (256.25 g): Create structure and stability in the filling by adding bulk and shortening's firming properties, giving the marshmallow filling a pipeable, creamy consistency. Combine with marshmallow fluff and confectioners' sugar to hold shape at room temperature. Keep cool to prevent melting.
• 1 cup (120 g) confectioners' sugar: Add sweetness and help stabilize and thicken the marshmallow filling, producing a smooth, pipeable texture that holds shape between cake layers. Sift before mixing to avoid lumps and ensure even incorporation with fats and fluff. Adjust quantity to reach desired sweetness and firmness.
• 1 tablespoon vanilla extract: Provide a secondary layer of warm vanilla aroma and depth in the filling, enhancing the marshmallow's sweetness and rounding other flavors. Add near the end of mixing to retain aromatic intensity. Small amounts significantly impact flavor complexity.
• 8 ounces milk chocolate chips (226.8 g), or solid chocolate, finely chopped: Form a glossy, chocolate ganache when melted with cream, supplying the rich milk chocolate element common in s'mores and adding a decadent contrast to the sweet filling. Chop or use chips for even melting and temper chocolate if needed for shine. Cool slightly before assembling to prevent over-softening.
• 1/2 cup (119 ml) heavy cream: Create a smooth, pourable cream that, when heated, melts chocolate into a silky ganache to coat or sandwich with the marshmallow filling, adding richness and shine. Warm gently to avoid scalding, then combine with chocolate and stir until glossy and homogeneous.

Directions for S’mores Whoopie Pies

These directions walk you from batter to fully assembled whoopie pies, and I recommend reading all steps first so you can stage tasks. I like to make the ganache while the cakes cool and whip the marshmallow filling last so everything is fresh for assembly.

1. Make the Graham Cookies: Position a rack in the center of the oven and preheat the oven to 375 degrees F. Line two baking sheets with parchment paper.: Position a rack in the center of the oven and preheat the oven to 375 degrees F. Line two baking sheets with parchment paper. : You will notice a warm bakery smell as the oven heats and the parchment laid out makes cleanup simple. Preheating ensures even oven spring, and positioning the rack centrally gives the cakes room to dome without browning too fast on the bottom. A common mistake is putting the rack too low, which can cause overly browned undersides, so double check placement first.
2. In a medium bowl, stir together both flours, baking powder, and salt.: As you whisk, the mixture will develop a uniform sandy texture and you may see small clumps that disappear with whisking. This dry mix ensures even distribution of leavening so each cake rises the same way. Avoid mixing wet and dry too vigorously later, since overmixing the batter can lead to tough cakes.
3. In the work bowl of a stand mixer fitted with the paddle attachment, beat together the butter, shortening and brown sugar until light and creamy, about 3 minutes. Add the eggs and the buttermilk and beat until combined.: The butter and sugars aerate into a pale, creamy mass, and you will hear the mixer change tone as it becomes fluffier. Adding eggs and buttermilk next creates an emulsion that yields a tender crumb. If you skip proper creaming, the cakes may be dense, so scrape down the bowl to ensure everything is fully combined.
4. In a measuring cup, combine the milk, baking soda, and vinegar. Add the milk mixture to the batter along with the flour mixture and beat on low speed until just combined. Add the vanilla and beat on medium speed for about 2 minutes, until completely combined.: When the milk mixture hits the batter you may see small bubbling as the baking soda activates, which helps create lift. Folding the dry ingredients in gently prevents gluten overdevelopment, while the final beat smooths the batter to a uniform sheen. Be careful not to overmix, or the cakes will lose their tenderness and become chewy.
5. Using a spoon, drop about 1 tablespoon of batter onto one of the prepared baking sheets and repeat, spacing them at least 2 inches apart. Bake one sheet at a time for about 10 minutes each, or until the cakes begin to brown. Remove from the oven and let the cakes cool on the sheet for at least 5 minutes before transferring them to a rack to cool completely.: The batter should fall in a slightly rounded mound that flattens a touch as it spreads. In the oven you will hear gentle bubbling and see the edges firm while the centers remain soft, a sign they are done. Leaving them on the baking sheet allows residual heat to finish cooking. Resist the urge to move them immediately, as they can tear if transferred too soon.
6. Make the Chocolate Ganache Filling: Put the chocolate in a large, heatproof bowl. Heat the cream in a large, heavy saucepan over medium heat just until it bubbles. Pour the hot cream over the chocolate in the bowl and let it sit for about 10 minutes, until the chocolate is melted. Stir with a wooden spoon or spatula until smooth. Allow the mixture to rest at room temperature until firm enough to spread, about 2 hours. You may also refrigerate the mixture for about 30 minutes, until it is firm enough to spread, stirring every 10 minutes.: Put the chocolate in a large, heatproof bowl. Heat the cream in a large, heavy saucepan over medium heat just until it bubbles. Pour the hot cream over the chocolate in the bowl and let it sit for about 10 minutes, until the chocolate is melted. Stir with a wooden spoon or spatula until smooth. Allow the mixture to rest at room temperature until firm enough to spread, about 2 hours. You may also refrigerate the mixture for about 30 minutes, until it is firm enough to spread, stirring every 10 minutes. : As the hot cream softens the chocolate , you will see glossy ribbons form when you stir, and the aroma will deepen to a rich cocoa scent. Resting the ganache lets it thicken to a spreadable consistency so it does not ooze from the whoopie pies. Avoid overheating the chocolate in the microwave, which can cause grainy texture; gentle, even heat is key.
7. Make the Marshmallow Filling: In the work bowl of a stand mixer fitted with the paddle attachment, beat together the Marshmallow Fluff and the vegetable shortening, starting on low and increasing to medium speed until the mixture is smooth and fluffy, about 3 minutes. Reduce mixer speed to low, add the confectioners' sugar and the vanilla, and beat until incorporated. Increase mixer speed to medium and beat until fluffy, about 3 minutes more.: In the work bowl of a stand mixer fitted with the paddle attachment, beat together the Marshmallow Fluff and the vegetable shortening, starting on low and increasing to medium speed until the mixture is smooth and fluffy, about 3 minutes. Reduce mixer speed to low, add the confectioners' sugar and the vanilla, and beat until incorporated. Increase mixer speed to medium and beat until fluffy, about 3 minutes more. : The mixture will transform from glossy and sticky to soft peaks that hold shape, and the scent will be sweet and vanilla forward. The shortening stabilizes the filling so it spreads cleanly between cakes and resists weeping. A typical misstep is adding the sugar too quickly, which can create dusting or lumps, so add it gradually.
8. Assemble the whoopie pies: Pipe or spread (whatever your preferred method) a layer of chocolate ganache filling onto the flat side of one of the cakes. Using the same method, top the chocolate filling with the marshmallow filling. Top it with another cake, flat-side down. Repeat with the rest of the cakes and filling.: Pipe or spread (whatever your preferred method) a layer of chocolate ganache filling onto the flat side of one of the cakes. Using the same method, top the chocolate filling with the marshmallow filling. Top it with another cake, flat-side down. Repeat with the rest of the cakes and filling. : When assembling, press gently so fillings meet the edges without squishing out, and you will hear a faint give as the cakes nestle together. The contrast of glossy ganache and billowy marshmallow is visually appealing and offers a pleasant mouthfeel. A common error is overfilling, which makes the whoopie pies messy, so use a measured dollop for consistent results.

Helpful Hints

I keep these hints focused on practical choices that make the process smoother from bake to assembly. They cover timing, texture checks, storage, and small swaps that preserve the classic flavor while improving reliability.

• Measure precisely: Accurate weighing or spoon and level measuring keeps the cake texture consistent and ensures the right dome and crumb.
• Room temperature fats: Using room temperature unsalted butter and slightly softened shortening helps ingredients cream together properly, creating a lighter batter.
• Staging saves stress: Bake the cakes, then make the ganache and marshmallow filling while they cool so assembly is a calm, final step.
• Watch oven cues: Look for golden edges and a set center rather than strictly relying on time, as ovens vary and visual cues are more reliable.
• Chill gently if needed: If the ganache is too soft, refrigerate in short intervals, stirring between checks to maintain a smooth texture.
• Storage tip: Keep assembled whoopie pies at room temperature in an airtight container for up to five days, or freeze individually wrapped for longer storage.

How to Enjoy S’mores Whoopie Pies

These treats are perfect for casual gatherings, summer parties, and dessert tables because they are handheld and nostalgic. I like to present them on a simple platter, arranging them so the glossy ganache faces up for the best visual impact.

• Serve at room temperature: This ensures the ganache is soft and the marshmallow filling is pillowy, which yields the best texture contrast.
• Occasions: Perfect for backyard barbecues, dessert buffets, birthday parties, and weekend baking sessions when friends or family drop by for a relaxed visit.
• Pairings: They go well with a simple fruit plate for balance, or offer coffee and tea so guests can cleanse their palate between bites.
• Presentation: Stack on a tiered tray or place single pies in cupcake liners for easy serving at a party.
• Make ahead: Bake components in advance and assemble the day of so the fillings are fresh and the texture is ideal when served.
• Freezing: Wrap individually and freeze in a single layer in a freezer safe container for up to one month, then thaw to room temperature before serving.

FAQ

Conclusion

What makes these S’mores Whoopie Pies special is how they capture the core flavors of campfire s’mores in a neat, handheld package that balances soft cake with rich ganache and fluffy marshmallow. Give them a try the next time you want a nostalgic dessert with minimal fuss, and you may find that friends and family request them repeatedly. They are forgiving to make, adaptable to small ingredient swaps, and the ritual of assembling them is half the fun, so take your time and enjoy the process.

S'mores Whoopie Pies

S'mores Whoopie Pies are soft graham flavored cakes sandwiched with silky chocolate ganache and a fluffy marshmallow filling, creating a creamy and nostalgic dessert. This easy to assemble treat brings campfire flavors into a portable format that works for parties and weeknight baking alike, delivering crispy edges, tender crumbs, and indulgent fillings in every bite, a compelling reason to make them soon.

Print Recipe Pin Recipe

Prep Time 40 minutes mins

Cook Time 10 minutes mins

Total Time 50 minutes mins

Servings: 24 assembled whoopie pies

Course: Desserts

Cuisine: American

Calories: 250

Ingredients Equipment Method Notes

Ingredients

  

• 1 1/2 cup graham flour (180 g) Provide a lightly sweet, slightly nutty graham flavor and tender crumb to the cakes, contributing authentic s'mores character and subtle caramel notes. Replace part of the flour blend to maintain structure while giving a distinctive cracker-like taste. Use measured scoops to preserve texture and color.
• 3/4 cup (93.75 g) all-purpose flour Add gluten and structure to the batter, helping the whoopie pies hold their shape and provide a soft, cakey crumb when combined with the graham flour. Balance texture by controlling the total flour weight to avoid toughness. Sift or whisk with other dry ingredients for even distribution.
• 1 1/2 teaspoon baking powder (1.5 teaspoons) Leaven the cakes by producing carbon dioxide when heated, promoting lift and a light, cake-like texture in the whoopie pies. Reacts with liquids and acids to create pockets of air, so distribute evenly among dry ingredients. Measure precisely to prevent over- or under-rising.
• 1/2 teaspoon (0.5 teaspoon) salt Enhance overall flavor balance and strengthen gluten formation slightly while moderating saltiness across the batter. Help regulate yeast or chemical leavening interactions and improve mouthfeel. Dissolve or mix uniformly into dry ingredients to avoid concentrated salty spots.
• 4 tablespoons unsalted butter, at room temperature Contribute richness, moisture, and flavor while creating an emulsion that helps trap air during creaming for lighter cakes. Soften to room temperature to ensure smooth creaming with sugars, enabling better volume and uniform texture. Avoid overheating which can alter the batter's consistency.
• 4 tablespoons vegetable shortening Stabilize the fat blend and add tenderness while contributing a softer texture to the whoopie pies, especially at room temperature. Combine with butter to create a workable shortening-butter mix that improves spread and structure. Use measured amounts to maintain the intended mouthfeel.
• 1 cup (220 g) packed dark brown sugar Provide moistness, deep caramel and molasses notes, and sweetness that enrich the flavor and color of the cakes. Pack firmly to ensure consistent sweetness and humidity in the batter, which affects crumb and chewiness. Cream well with fats to dissolve and aerate the mixture.
• 2 large eggs Bind the batter, add moisture, color, and structure, and help with leavening through steam and protein setting during baking. Bring to room temperature for even incorporation and to prevent batter from curdling. Beat in thoroughly to distribute proteins and fats uniformly.
• 1/2 cup (120 ml) buttermilk Add acidity and a tender crumb while balancing liquid content and contributing to chemical reactions with baking soda. Temper the buttermilk if chilled to avoid seizing fats and to promote even mixing. Measure accurately to maintain batter consistency and flavor.
• 2 tablespoons milk Adjust the batter's consistency and add a touch of extra moisture, helping the dry ingredients hydrate and yielding a softer cake. Use as needed to fine-tune batter viscosity for proper piping or scooping. Warm slightly if cold to blend smoothly into the mixture.
• 1 teaspoon baking soda Provide quick leavening when combined with an acid, producing carbon dioxide that lightens the texture and gives a gentle rise to the cakes. Dissolve into wet ingredients or mix into dry components for even action. Pair with vinegar or buttermilk for optimal effect.
• 1 teaspoon white vinegar React with baking soda to produce carbon dioxide and enhance the rise and tenderness of the whoopie pies, creating a softer crumb and slight lift. Add to wet ingredients to ensure full activation and even distribution. Measure precisely to avoid metallic or soapy tastes.
• 1 teaspoon vanilla extract Impart warm, aromatic notes and enhance the overall flavor profile of both the cakes and filling with a familiar sweet vanilla character. Use pure extract for more depth, adding at the end of mixing to preserve volatile aromatics. Small variations change flavor balance noticeably.
• 1 1/2 cup Marshmallow Fluff (190.5 g), or other prepared marshmallow cream, which will do in a pinch Provide a fluffy, sweet marshmallow center with creamy texture and classic s'mores sweetness, functioning as the sandwich filling. Spread easily between cake rounds and stabilizes the sandwich structure, adding both chew and lightness. Use as-is or whip slightly for a lighter finish.
• 1 1/4 cup vegetable shortening (256.25 g) Create structure and stability in the filling by adding bulk and shortening's firming properties, giving the marshmallow filling a pipeable, creamy consistency. Combine with marshmallow fluff and confectioners' sugar to hold shape at room temperature. Keep cool to prevent melting.
• 1 cup (120 g) confectioners' sugar Add sweetness and help stabilize and thicken the marshmallow filling, producing a smooth, pipeable texture that holds shape between cake layers. Sift before mixing to avoid lumps and ensure even incorporation with fats and fluff. Adjust quantity to reach desired sweetness and firmness.
• 1 tablespoon vanilla extract Provide a secondary layer of warm vanilla aroma and depth in the filling, enhancing the marshmallow's sweetness and rounding other flavors. Add near the end of mixing to retain aromatic intensity. Small amounts significantly impact flavor complexity.
• 8 ounces milk chocolate chips (226.8 g), or solid chocolate, finely chopped Form a glossy, chocolate ganache when melted with cream, supplying the rich milk chocolate element common in s'mores and adding a decadent contrast to the sweet filling. Chop or use chips for even melting and temper chocolate if needed for shine. Cool slightly before assembling to prevent over-softening.
• 1/2 cup (119 ml) heavy cream Create a smooth, pourable cream that, when heated, melts chocolate into a silky ganache to coat or sandwich with the marshmallow filling, adding richness and shine. Warm gently to avoid scalding, then combine with chocolate and stir until glossy and homogeneous.

Equipment

• Stand mixer
• Paddle attachment
• Mixing Bowls
• Baking sheets
• Parchment Paper
• Heatproof Bowl
• Saucepan
• Spatula
• Cooling rack

Method

 

1. Make the Graham Cookies: Position a rack in the center of the oven and preheat the oven to 375 degrees F. Line two baking sheets with parchment paper.: Position a rack in the center of the oven and preheat the oven to 375 degrees F. Line two baking sheets with parchment paper. : You will notice a warm bakery smell as the oven heats and the parchment laid out makes cleanup simple. Preheating ensures even oven spring, and positioning the rack centrally gives the cakes room to dome without browning too fast on the bottom. A common mistake is putting the rack too low, which can cause overly browned undersides, so double check placement first.
2. In a medium bowl, stir together both flours, baking powder, and salt.: As you whisk, the mixture will develop a uniform sandy texture and you may see small clumps that disappear with whisking. This dry mix ensures even distribution of leavening so each cake rises the same way. Avoid mixing wet and dry too vigorously later, since overmixing the batter can lead to tough cakes.
3. In the work bowl of a stand mixer fitted with the paddle attachment, beat together the butter, shortening and brown sugar until light and creamy, about 3 minutes. Add the eggs and the buttermilk and beat until combined.: The butter and sugars aerate into a pale, creamy mass, and you will hear the mixer change tone as it becomes fluffier. Adding eggs and buttermilk next creates an emulsion that yields a tender crumb. If you skip proper creaming, the cakes may be dense, so scrape down the bowl to ensure everything is fully combined.
4. In a measuring cup, combine the milk, baking soda, and vinegar. Add the milk mixture to the batter along with the flour mixture and beat on low speed until just combined. Add the vanilla and beat on medium speed for about 2 minutes, until completely combined.: When the milk mixture hits the batter you may see small bubbling as the baking soda activates, which helps create lift. Folding the dry ingredients in gently prevents gluten overdevelopment, while the final beat smooths the batter to a uniform sheen. Be careful not to overmix, or the cakes will lose their tenderness and become chewy.
5. Using a spoon, drop about 1 tablespoon of batter onto one of the prepared baking sheets and repeat, spacing them at least 2 inches apart. Bake one sheet at a time for about 10 minutes each, or until the cakes begin to brown. Remove from the oven and let the cakes cool on the sheet for at least 5 minutes before transferring them to a rack to cool completely.: The batter should fall in a slightly rounded mound that flattens a touch as it spreads. In the oven you will hear gentle bubbling and see the edges firm while the centers remain soft, a sign they are done. Leaving them on the baking sheet allows residual heat to finish cooking. Resist the urge to move them immediately, as they can tear if transferred too soon.
6. Make the Chocolate Ganache Filling: Put the chocolate in a large, heatproof bowl. Heat the cream in a large, heavy saucepan over medium heat just until it bubbles. Pour the hot cream over the chocolate in the bowl and let it sit for about 10 minutes, until the chocolate is melted. Stir with a wooden spoon or spatula until smooth. Allow the mixture to rest at room temperature until firm enough to spread, about 2 hours. You may also refrigerate the mixture for about 30 minutes, until it is firm enough to spread, stirring every 10 minutes.: Put the chocolate in a large, heatproof bowl. Heat the cream in a large, heavy saucepan over medium heat just until it bubbles. Pour the hot cream over the chocolate in the bowl and let it sit for about 10 minutes, until the chocolate is melted. Stir with a wooden spoon or spatula until smooth. Allow the mixture to rest at room temperature until firm enough to spread, about 2 hours. You may also refrigerate the mixture for about 30 minutes, until it is firm enough to spread, stirring every 10 minutes. : As the hot cream softens the chocolate , you will see glossy ribbons form when you stir, and the aroma will deepen to a rich cocoa scent. Resting the ganache lets it thicken to a spreadable consistency so it does not ooze from the whoopie pies. Avoid overheating the chocolate in the microwave, which can cause grainy texture; gentle, even heat is key.
7. Make the Marshmallow Filling: In the work bowl of a stand mixer fitted with the paddle attachment, beat together the Marshmallow Fluff and the vegetable shortening, starting on low and increasing to medium speed until the mixture is smooth and fluffy, about 3 minutes. Reduce mixer speed to low, add the confectioners' sugar and the vanilla, and beat until incorporated. Increase mixer speed to medium and beat until fluffy, about 3 minutes more.: In the work bowl of a stand mixer fitted with the paddle attachment, beat together the Marshmallow Fluff and the vegetable shortening, starting on low and increasing to medium speed until the mixture is smooth and fluffy, about 3 minutes. Reduce mixer speed to low, add the confectioners' sugar and the vanilla, and beat until incorporated. Increase mixer speed to medium and beat until fluffy, about 3 minutes more. : The mixture will transform from glossy and sticky to soft peaks that hold shape, and the scent will be sweet and vanilla forward. The shortening stabilizes the filling so it spreads cleanly between cakes and resists weeping. A typical misstep is adding the sugar too quickly, which can create dusting or lumps, so add it gradually.
8. Assemble the whoopie pies: Pipe or spread (whatever your preferred method) a layer of chocolate ganache filling onto the flat side of one of the cakes. Using the same method, top the chocolate filling with the marshmallow filling. Top it with another cake, flat-side down. Repeat with the rest of the cakes and filling.: Pipe or spread (whatever your preferred method) a layer of chocolate ganache filling onto the flat side of one of the cakes. Using the same method, top the chocolate filling with the marshmallow filling. Top it with another cake, flat-side down. Repeat with the rest of the cakes and filling. : When assembling, press gently so fillings meet the edges without squishing out, and you will hear a faint give as the cakes nestle together. The contrast of glossy ganache and billowy marshmallow is visually appealing and offers a pleasant mouthfeel. A common error is overfilling, which makes the whoopie pies messy, so use a measured dollop for consistent results.

Notes

• Measure precisely: Accurate weighing or spoon and level measuring keeps the cake texture consistent and ensures the right dome and crumb.
• Room temperature fats: Using room temperature unsalted butter and slightly softened shortening helps ingredients cream together properly, creating a lighter batter.
• Staging saves stress: Bake the cakes, then make the ganache and marshmallow filling while they cool so assembly is a calm, final step.
• Watch oven cues: Look for golden edges and a set center rather than strictly relying on time, as ovens vary and visual cues are more reliable.
• Chill gently if needed: If the ganache is too soft, refrigerate in short intervals, stirring between checks to maintain a smooth texture.
• Storage tip: Keep assembled whoopie pies at room temperature in an airtight container for up to five days, or freeze individually wrapped for longer storage.

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Meet Sophie Chen

I’m the texture and flavor obsessive. I can’t stand mushy vegetables or bland sauces, so I’m constantly tweaking recipes to add crunch, depth, and that certain something that makes you go back for seconds. I love bold seasonings, crispy edges, and recipes that wake up your taste buds. I’m the one in our group photos with sauce on my shirt because I’m always tasting as I go. If it doesn’t make me smile, it doesn’t make the blog.