1/2 cup (1 stick) unsalted butter, at room temperature
1 cup smooth peanut butter
1 (8-ounce) package cream cheese, at room temperature
4 cups confectioners' sugar
1 tablespoon milk
Beat the butter, peanut butter, and cream cheese with a hand or standing mixer on medium speed, until light and fluffy. Slowly add the confectioner's sugar and continue to mix until the frosting is smooth, mix in the milk and continue to mix until it reaches a good spreading consisting.