Ingredients
For the Cake:
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2 cups mashed cooked sweet potatoes (about 2 large sweet potatoes)
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3 cups all-purpose flour
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2 teaspoons baking powder
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½ teaspoon baking soda
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½ teaspoon salt
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1 teaspoon ground cinnamon
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½ teaspoon ground nutmeg
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1 cup unsalted butter, softened
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½ cup vegetable oil
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2 ¾ cups granulated sugar
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5 large eggs
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1 teaspoon vanilla extract
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½ cup sour cream
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½ cup whole milk
For the Glaze (optional):
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1 cup powdered sugar
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2 tablespoons milk
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½ teaspoon vanilla extract
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Dash of cinnamon (optional)
Instructions
Wash, peel, and boil the sweet potatoes until fork-tender (about 20-25 minutes). Mash them well and set aside to cool completely. You should have about 2 cups.
Preheat your oven to 325°F (165°C). Grease and flour a 10-inch bundt or tube pan thoroughly.
In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg. Set aside.
In a stand mixer or large mixing bowl, cream the butter, oil, and sugar together until light and fluffy—this should take about 4-5 minutes.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
Mix in the mashed sweet potatoes until fully incorporated and smooth.
Alternately add the flour mixture and milk/sour cream to the batter, starting and ending with the dry ingredients. Mix until just combined—do not overmix.
Pour the batter into the prepared pan and smooth the top. Bake for 75–85 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cake to cool in the pan for 15 minutes, then invert it onto a wire rack to cool completely.
Whisk together the powdered sugar, milk, and vanilla. Drizzle over the cooled cake and allow it to set before slicing.
Notes
Make sure the sweet potatoes are completely cool before mixing into the batter. Warm mash can curdle the butter or scramble the eggs if added too early.