Rustic Sweet Potato Cake

This rustic sweet potato cake is a tender, spiced layer cake with natural sweetness from roasted sweet potatoes and a light crumb that stays moist for days. The key is using actual roasted sweet potatoes rather than canned puree, which gives deeper flavor and better texture.

Ingredients for Rustic Sweet Potato Cake

Sweet potatoes provide the structure and moisture, while butter creates a tender crumb. Eggs bind everything together and help the cake rise. all-purpose flour gives structure without making it tough. Brown sugar adds warmth and keeps the cake moist, while cinnamon, nutmeg, ginger, and cloves bring spice depth. Baking powder and baking soda leaven the batter. Salt balances sweetness. Vanilla extract rounds out the flavor. A touch of sour cream adds tang and keeps the crumb tender.

Why This Rustic Sweet Potato Cake Works

Roasted sweet potatoes have less water than canned puree, so the batter stays thick and the cake rises properly instead of sinking. The natural starches help hold moisture without making the cake gummy.

Mixing the batter just until combined prevents overdeveloping the flour, which would make the cake tough and dense. The spices bloom in the oven heat, deepening as the cake bakes.

Sour cream adds acid that reacts with the baking soda to create lift, and the fat in sour cream keeps the crumb tender even after the cake sits for a day or two.

Mistakes To Avoid

Overmixing the batter after adding flour develops gluten and makes the cake tough and dry. Stop mixing as soon as no streaks of dry flour remain.

Using canned sweet potato puree instead of roasted adds extra water to the batter, causing the cake to sink in the middle and bake unevenly. Roasting takes 45 minutes but makes a real difference.

Pulling the cake out too early leaves the center underbaked and the cake collapses as it cools. The toothpick test is reliable: if it comes out with wet batter, the cake needs another 2 to 3 minutes.

Cutting the cake while it is still warm breaks the crumb apart. Let it cool in the pan for 15 minutes, then turn it out onto a rack and cool completely before slicing or frosting.

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Ingredients

• 1 pound sweet potatoes, roasted and cooled
• 1/2 cup unsalted butter, softened
• 1 1/4 cups brown sugar, packed
• 2 large eggs, room temperature
• 1 3/4 cups all-purpose flour (240 grams)
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1/2 teaspoon ground nutmeg
• 1/4 teaspoon ground ginger
• 1/8 teaspoon ground cloves
• 1/2 teaspoon kosher salt
• 1 teaspoon vanilla extract
• 1/2 cup sour cream, room temperature

Step-by-step Instructions

1. Preheat the oven to 350°F (175°C). Grease two 9-inch round cake pans and line the bottoms with parchment paper.
2. Scoop the cooled roasted sweet potato flesh into a bowl and mash until mostly smooth with a few small lumps remaining.
3. In a large bowl, beat the softened butter and brown sugar with an electric mixer on medium speed for 2 to 3 minutes until light and fluffy.
4. Add the eggs one at a time, beating on medium speed for 30 seconds after each addition until fully combined.
5. In a separate bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, cloves, and salt.
6. Add half the flour mixture to the butter mixture and beat on low speed for 20 seconds until just combined. Add the mashed sweet potato and sour cream and beat for 20 seconds. Add the remaining flour mixture and vanilla extract and beat on low speed for 20 to 30 seconds until no streaks of dry flour remain. Do not overmix.
7. Divide the batter evenly between the prepared pans and smooth the tops with a spatula.
8. Bake at 350°F (175°C) for 45 to 50 minutes until a toothpick inserted in the center comes out with a few moist crumbs, not wet batter.
9. Cool the cakes in the pans for 15 minutes, then turn them out onto a wire rack and cool completely to room temperature, about 1 hour.