Preheat oven to 350 degrees. Line 9 cups of a muffin tin with paper liners or grease well. Set aside.: The moment your oven warms, you will smell a faint toasty note that signals readiness, and the steady warmth ensures an even rise. I always set the rack to the center so heat circulates uniformly, which helps the muffins dome evenly. If your oven runs hot or cool, an inexpensive oven thermometer will prevent underbaked or overbaked centers, a common mistake here.
First, make the streusel topping. Place the graham crackers in a Ziploc bag and seal. Using a rolling pin or other heavy object, crush the graham crackers. I like to leave a few bigger chunks to give the streusel texture. In a small bowl, combine graham cracker crumbs, flour, brown sugar, and melted butter. Stir until moistened. Set aside.: The liners protect the muffins and make them easy to transport, while greasing well gives a beautiful golden exterior. Press each liner flat into the cup so the batter fills smoothly. One pitfall is under greasing when skipping liners, which can cause the muffins to stick to the pan and break when removed.
Next, make the cheesecake filling. In a small bowl, stir together cream cheese, sugar, and lemon zest. Set aside.: Crushing the graham crackers releases a warm, toasty scent and creates the base crunch for the muffins. I like to leave a few larger crumbs for contrast, because complete pulverization makes the streusel too fine. Combine the crumbs with the measured all-purpose flour , light brown sugar , and melted unsalted butter , stirring until the mixture looks moist but still crumbly. If the streusel clumps into one mass, you likely added too much melted butter at once; gently break it up with a fork to restore texture.
In a medium bowl, whisk together the flour, baking powder, salt, and sugar.: When you stir the cream cheese with the tablespoon of granulated sugar and the lemon zest , the mixture becomes luxuriously smooth and aromatic. I mash and whisk until no lumps remain, and I taste a tiny bit to ensure the sugar and lemon are balanced. A common mistake is using chilled cream cheese , which can clump; bringing it to room temperature prevents graininess and yields a silky filling.
In a small bowl, combine canola oil, egg, buttermilk, and vanilla together. Whisk until well combined.: The dry mix should look uniform and slightly airy, and you may notice a faint sweet scent from the sugar. Whisking distributes the leavener and salt evenly, which matters for consistent rise and flavor. If you skip whisking, some muffins might rise higher than others or taste unevenly seasoned.
Incorporate the wet ingredients into flour mixture. Add slowly and gently stir, you don't want to over mix. The batter will be thick. Carefully fold in the strawberries.: Whisking these wet ingredients produces a glossy, slightly viscous mixture that smells faintly of vanilla and buttermilk tang. Emulsifying the oil with the egg helps the batter hold together and keeps the crumb tender. Overbeating here is less risky than under mixing, but avoid vigorous whisking that incorporates too much air, which can lead to uneven crumb.
Fill each muffin cup with about 1 heaping tablespoon of batter. You want the bottom of the muffin cup to be covered. Next, add one teaspoon of the cheesecake filling to each muffin cup. Cover the filling with the remaining batter. Sprinkle each muffin with graham cracker streusel.: At this stage you will notice the batter thicken, and the scent will shift from sweet flour to a more rounded, buttery aroma. Add the wet mix slowly and fold gently, because over mixing activates gluten and makes muffins tough. The batter should be thick but spoonable; if it looks gluey, you may have overmixed. Carefully fold in the chopped strawberries , distributing them so each pocket has fruit without turning the batter pink throughout.
Bake muffins for 18-20 minutes, or until muffins are golden brown and a toothpick comes out clean. Remove the muffins from the pan and let cool on a cooling rack.: The bottom of the muffin cup should be just covered, which creates a base for the filling. Then add one teaspoon of the cheesecake filling into each cup, where it will nestle and create a creamy center that contrasts with the cake. Cover the filling with the remaining batter and finish by sprinkling the graham cracker streusel on top. You should be able to see layers forming, and the streusel will look noticeably drier than the batter. A common misstep is packing too much batter over the filling, which can bury the cheesecake so it does not peek out attractively.
Note-you can easily double this recipe.: As they bake you will smell a warm, sweet aroma with hints of butter and fruit. The tops should turn golden and slightly spring back when touched. Use a toothpick in the muffin side, not the cheesecake center, because the filling may be moist yet fully set. If you remove them too early the centers can collapse, so err on the side of a couple extra minutes if unsure.
Remove the muffins from the pan and let cool on a cooling rack: Cooling lets the interior finish setting and prevents the tops from becoming soggy from trapped steam. As they cool you will feel the residual warmth and hear a faint crackle as the streusel settles. If you try to remove them too soon, they can break or the filling can ooze, so allow at least 10 minutes in the tin before transferring.
Note you can easily double this recipe: Doubling is straightforward because the method scales well, but keep an eye on baking time since a fuller oven can affect heat circulation. I advise spacing pans and rotating them halfway through baking when doubling, to ensure even browning. A frequent error is crowding the oven, which leads to unevenly baked muffins, so give each pan room to breathe.
