Fluffy, creamy peanut butter buttercream. This easy frosting recipe is perfect for cupcakes, brownies, birthday cake or anything that goes with peanut butter! I think this peanut butter buttercream just might be my all-time favorite thing. (Sorry boyfriend). Creamy, fluffy, salty sweet, peanut buttery goodness. Seriously – it’s like the center of a peanut butter …