1 stick butter
1/2 c. oil
4 tbsp. cocoa
1 c. water
2 c. flour
2 c. sugar
1/2 c. buttermilk
2 eggs
1 tsp. baking soda
1 tsp. vanilla

In saucepan bring to a boil butter, oil, cocoa, and water. Sift together flour and sugar. Pour chocolate sauce over dry ingredients and mix well. Add buttermilk, eggs, baking soda, and vanilla. Pour into a greased cookie sheet. Bake at 400 degrees for 20 minutes.

CHOCOLATE SHEET CAKE FROSTING:

1 stick butter
4 tbsp. cocoa
1/3 c. buttermilk
1 lb. confectioners sugar
1/2 tsp. salt
1 tsp. vanilla
1 c. chopped nuts

Bring to a boil butter and cocoa. Remove from heat; add remaining ingredients adding nuts last. Spread immediately while still hot.