1/2 c. butter
1/4 c. cocoa
1 tbsp. milk
1 box (16 oz.) powdered sugar, sifted
1 tsp. vanilla

Combine butter, cocoa and milk in saucepan. Bring to boiling. Remove from heat. Vigorously stir in powdered sugar and vanilla. Blend until smooth.

After cake comes from oven, immediately spread with frosting and sprinkle with nuts, if used. Cool, cut into squares of desired size.