Creamy peanut butter is the best peanut butter for this peanut butter frosting recipe because it will create a wonderfully smooth frosting. I have used natural peanut butter, freshly ground peanut butter, and more commercial peanut butter in this recipe with good success.
Using a hand mixer or whisk attachment on a stand mixer, beat together the peanut butter and butter at medium speed, until light and fluffy.
Reduce speed to low and gradually add the powdered sugar.
Increase mixer speed back to medium and add 2 tablespoons of milk, adding an additional 1 tablespoon at a time until desired consistency is reached.
Increase the speed to high and beat until light and fluffy.
Immediately frost your cooled cakes or cupcakes, or store them in an airtight container for later use.
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