Bake devils' food cake in pan; cool.

1 c. peanut butter
1 tbsp. peanut oil

2/3 stick butter
3 tbsp. cocoa
4 tbsp. buttermilk
2/3 box powdered sugar
3/4 tsp. vanilla

Bring butter, cocoa and buttermilk to a boil; pour boiled mixture over powdered sugar. Add vanilla and mix well with a spoon. Spread and cut into squares.