2cupsmashed sweet potatoesyield from about 3 medium-large sweet potatoes
1 1/2teaspoonspumpkin spice mixOR 1/2 teaspoon each ground nutmeg, cloves and allspice
For the topping
1/4cuppecan nutsroughly chopped
Prep: Preheat oven to 350°F. Line a 7x11 inch baking pan with baking parchment.
Beat wet ingredients: In a large bowl, beat the butter and both sugars with an electric mixer until creamy, about 5 minutes. Add the eggs and continue beating until light in color and foamy. Stir in the maple syrup and sweet potato purée.
Make batter: Sift the remaining cake ingredients into the bowl and stir everything into a dense batter. Pour the batter into the prepared baking dish.
Streusel: To make the streusel topping crumble all topping ingredients together in a small bowl until crumbs form. Scatter evenly over the batter.
Bake: Bake the cake for 40-45 minutes, or until a toothpick inserted comes out just clean. Cool in the pan on a wire rack for 30 minutes, then serve warm.