Preheat oven to 350 degrees. ... 9 inch layer cake pans. Sift flour with cocoa, ... butter with sugar, potatoes and egg yolks until light ... and cook completely. Frost.
Cream butter and sugar; add sweet potatoes and beat until light and ... minutes or until cake tests done. Spread with icing ... to make spreading consistency.
Cream shortening and sugar, add eggs and sweet potatoes. Sift cinnamon and baking ... greased and floured cake pan. Bake at 350 degrees ... to spread. Frost cake.