1 c. butter, softened
2 c. sugar
2 eggs
1 c. cold mashed potatoes
1 tsp. vanilla
2 c. flour
1/4 c. cocoa
1 tsp. baking soda
1 c. milk
1 c. chopped nuts

Cream butter and sugar until fluffy. Add eggs, beating well. Blend in potatoes and vanilla. Combine flour, cocoa, soda and 1/2 teaspoon salt. Add with milk, beating well. Stir in nuts. Bake at 350 degrees for 40-45 minutes in 9x13 inch pan.