CAKE:

2 c. plain flour
2 c. sugar
1 tsp. baking soda
3 tbsp. cocoa
2 eggs
2 sticks melted butter
1 tsp. vanilla
1 c. water
1/2 c. buttermilk

Sift first 4 ingredients. Add the others and mix together. Bake in greased, floured 13x9x2-inch pan at 350 degrees for 40 minutes.

FROSTING:

1 box confectioners sugar, sifted
4 tbsp. cocoa
1 stick melted butter
1 tsp. vanilla
1/2 c. buttermilk
1/2 c. peanut butter

Sift sugar and cocoa. Add other ingredients and mix together. Frost cake while hot. Let cool before cutting.