This Peanut Butter Frosting is the perfect way to top your favorite cake, cupcakes, or brownies! This from-scratch buttercream is full of smooth, creamy peanut butter flavor!
Cream the peanut butter and butter in a medium bowl with an electric mixer.
Add sugar, 3 tablespoons milk and the vanilla extract. Mix with an electric mixer on low for 1 minute. Increase the speed to medium and mix until well combined and fluffy.
Add the additional tablespoon of milk if frosting needs to be thinned out.