Peanut Butter Frosting

1/2 cup butter (softened)
1 cup peanut butter (creamy style)
4 cup powdered sugar
1/3 cup milk

In a large bowl, cream softened butter and peanut butter together with electric mixer. Slowly add half of the  sugar. Beat in 1/4 cup of the milk. Beat in the remaining amount of powdered sugar. Add rest of milk if consistency is too thin.