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Prepare the Sweet Potatoes:
Preheat your oven to 350°F (175°C). Pierce the sweet potatoes with a fork and bake them in the oven for 45-60 minutes, or until tender. Alternatively, you can microwave them until soft.
Once cooled, peel and mash the sweet potatoes until smooth. Measure out 1 cup of the mashed sweet potatoes for the cake.
Make the Cake Batter:
In a large bowl, combine the yellow cake mix, mashed sweet potatoes, vegetable oil, eggs, and sour cream. Mix until smooth and well combined.
Layer with Cinnamon Sugar:
Pour half of the cake batter into a greased 9×13-inch baking dish.
In a small bowl, mix the brown sugar and cinnamon together. Sprinkle half of this mixture evenly over the cake batter in the dish.
Pour the remaining cake batter over the cinnamon-sugar layer, then sprinkle the remaining cinnamon sugar on top. Swirl a knife through the batter gently to create a marbled effect.
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