Idaho Potato Cake
["1 c. butter or margarine", "2 c. sugar", "2 eggs", "1 c. cold mashed potatoes", "1 tsp. vanilla extract", "2 c. all-purpose flour", "1/4 c. baking cocoa", "1 tsp. baking soda", "1 c. milk", "1 c. chopped nuts"]
["In a mixing bowl, cream butter and sugar until fluffy.", "Add eggs, one at a time, beating well after each addition.", "Blend in potatoes and vanilla.", "Combine flour, cocoa and baking soda.", "Add alternately with milk, blending well after each addition.", "Stir in nuts.", "Pour into a greased 13 x 9 x 2-inch baking pan.", "Bake at 350\u00b0 for 40 to 45 minutes or until cake tests done.", "Cool on a wire rack."]
["butter", "sugar", "eggs", "cold mashed potatoes", "vanilla extract", "flour", "baking cocoa", "baking soda", "milk", "nuts"]