Preheat your oven to 350°F (175°C) and prepare two 6-inch cake pans by greasing them and lining the bottoms with parchment paper.
In a large bowl, sift together the flour, baking powder, cinnamon, nutmeg, cardamom, and salt.
In another bowl, beat together the melted butter, vegetable oil, vanilla extract, granulated sugar, and light-brown sugar until smooth and slightly fluffy.
Add the eggs to the wet mixture and mix until fully blended, then fold in the sweet potato puree.
Slowly add the dry ingredients to the wet mixture, mixing until just combined. Avoid overmixing.
Divide the batter evenly between the two prepared cake pans, smooth the tops, and bake for 20–25 minutes, or until a toothpick inserted comes out clean.
Allow the cakes to cool in the pans for about 5 minutes before transferring to wire racks to cool completely.
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Notes
Store unfrosted cake in an airtight container for up to 2 days, or refrigerate frosted cake for up to 5 days.