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