Cake: Preheat oven to 350 degrees. Cream butter and sugar. Add egg yolks and hot mashed potatoes and mix well. Sift together flour, baking powder, salt and cocoa. Add flour mixture alternately with milk to sugar mixture. Beat egg whites until stiff and fold in. Pour into 2 greased and lightly floured 9 inch layer cake pans. Bake 45 minutes or until done. Cool on rack for 5 minutes before removing from pans. When coldfrost with cream cheese frosting. Frosting: Mix cream cheese, vanilla, butter and powdered sugar together and frost cake. THE DESSERT SHOW SHOW #DS3032 AIR DATE: 1/26/96 ----