1 cup creamy peanut butter
8 tablespoons butter (1 stick) at room temperature
2 cups powdered sugar sifted
3 to 4 tablespoons milk
2 teaspoons pure vanilla extract
Place the peanut butter and butter in a large mixing bowl. Blend with an electric mixer on low speed until fluffy, 30 seconds. Stop the machine. Add the confectioners' sugar, 3 tablespoons of milk, and the vanilla. Blend with the mixer on low speed until the sugar is well combined, 1 minute. Increase the speed to medium and beat until the frosting lightens and is fluffy. Blend in up to 1 tablespoon milk if the frosting seems to stiff.