Prep your onion and sweet potato.: The air fills with a crisp, vegetal scent as you peel and chop the sweet potatoes , and the rhythm of slicing helps you settle into the process. Cutting the pieces to roughly 2 inch sizes ensures even softening under pressure, which is crucial for a uniformly creamy texture after blending. If pieces are wildly different sizes, some will overcook and others will stay firm, creating an uneven mouthfeel. Keep a steady cutting motion and use a sharp knife to avoid crushing the sweet potatoes , which can make them gummy.
Add the olive oil and onion to your Instant Pot and sauté for 5 minutes.: As the olive oil warms, it releases a fragrant, fruity note and the onion begins to sizzle, transforming from sharp to sweet and translucent. This step develops foundational flavors, because softened onion and lightly browned edges add depth and complexity that you will notice in every spoonful. A common mistake is rushing this step on high heat, which can scorch the onion and introduce bitterness, so aim for a gentle sauté until the pieces are soft and fragrant.
Add the sweet potatoes, vegetable broth, water, garlic, smoked paprika, and cinnamon to the pressure cooker. Make sure the valve is on "sealing" and cook on high pressure for 10 minutes. It'll take about 10-15 minutes for it to get up to pressure.: When you add the sweet potatoes , the pot starts to feel substantial, and the combination of liquids and spices produces an immediate savory steam that hints at the finished soup. The garlic will mingle with the smoked paprika and cinnamon , building a layered aroma. Ensuring the valve is set to sealing is a safety step as well as essential for pressure build up. Avoid overfilling the pot, and make sure solids are mostly submerged so they cook evenly. If spices clump, stir to distribute them evenly before sealing.
Once the countdown is finished, do a quick release.: As the cooker pressurizes, expect about 10 to 15 minutes of building steam and a growing, savory perfume. High pressure punctures the cell walls of the sweet potatoes , converting starches into velvety texture quickly. This controlled, intense heat shortens cooking time while enhancing flavor concentration. A frequent misstep is assuming the cook time includes pressurizing, so remember the active pressure time is focused on flavor extraction, not the total time from start to finish.
Blend the soup in batches (you may want to let it cool a bit first) or use a stick blender. Season with salt & pepper as needed (I found that I needed to be pretty generous with the salt). Add cream if desired (I skipped it). I'd start with 1/2 cup and work my way up from there.: Opening the valve lets steam rush out with a sharp, hissing sound and a gust of hot, aromatic air. Quick release stops further cooking instantly, preserving texture and preventing over softening which could make the soup gluey. Use caution and keep hands and face away from the steam path. If you prefer a gentler finish, you can allow a natural release for a few minutes, but quick release is perfect for preserving bright flavor and color.
Blend the soup in batches or use a stick blender: After the pot is safe to open, the steam gives way to a bowl full of tender sweet potatoes and fragrant broth. Blending transforms the mixture into a silky, cohesive soup; using a blender yields the smoothest texture while a stick blender is convenient and faster. The aroma will deepen as the texture changes, becoming creamy and comforting. A tip to avoid splatters is to blend in small batches and leave a vent in the blender lid, or let the soup cool slightly before puréeing. Overblending at high speed can heat the soup excessively and risk splattering, so pulse gently and check texture frequently.
Season with salt & pepper as needed and add cream if desired: Once the soup is smooth, the flavors become more concentrated, so taste and add salt and pepper gradually until the balance feels right. If you want a richer finish, stir in heavy cream or coconut milk a little at a time, watching how it softens the edge and enriches the mouthfeel. I often start with a half cup and adjust from there. A common oversight is adding too much cream at once, which can mask the natural sweetness of the sweet potatoes , so integrate slowly and taste as you go.
