1 cup softened butter or shortening, 1 cup confectioner's sugar, 1/2 cup creamy peanut butter, 1 tsp. vanilla, 1-3 tablespoons milk.
Cream together the butter and peanut butter, add in confectioner's sugar and vanilla. Slowly add in milk until desired consistency. Frosting is done! May refrigerate. Let frosting come up to room temperature before spreading.