Fluffy Peanut Butter Frosting

1/2 cup butter, softened

1 cup creamy peanut butter

3 tablespoons milk, or as needed

2 cups confectioners' sugar

Place the butter and peanut butter into a medium bowl, and beat with an electric mixer. Gradually mix in the sugar, and when it starts to get thick, incorporate milk one tablespoon at a time until all of the sugar is mixed in and the frosting is thick and spreadable. Beat for at least 3 minutes for it to get good and fluffy.

http://allrecipes.com/recipe/fluffy-peanut-butter-frosting/detail.aspx