Preheat oven to 350°F. In a large mixing bowl, cream together butter and sugars. Add eggs, one at a time, beating well after each addition. Add sweet potatoes; mix well. Gradually add House-Autry Buttermilk Biscuit mix and spices until combined. Add milk and vanilla; mix well. Divide batter evenly between two lightly greased and floured 9-inch round pans. Bake for 35 minutes or until a toothpick inserted into the middle comes out clean. Cool layers before frosting.
For frosting: Stir maple syrup into prepared frosting. Place one of the cake layers upside-down onto a plate. Spread half of the frosting on top. Place other cake layer upside-down onto the first layer, so that the top of cake is flat. Spread with remaining frosting. Optional: Garnish with toasted nuts.
