1/4 c. butter, not melted
1/c. peanut butter
1 lb. powdered sugar
1 1/2 tsp. vanilla
4 tbsp. milk

Place softened butter in bowl. Add peanut butter, sugar, vanilla and milk. Mix with electric mixer 2 to 3 minutes. If too thin add sugar, if too thick add milk.

Frost brownies, chocolate cake or cookies!