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easy peanut butter cake & peanut butter frosting

(22 ratings)
Blue Ribbon Recipe by
Mary Ann F
San Diego, CA

I made this in a pinch with ingredients I had sitting in the pantry. The cake is pretty darn tasty even without the frosting. My peanut butter-loving family says this is now their favorite dessert. And what doesn't go with peanut butter? You can drizzle chocolate on the frosting or place sliced bananas between a two-layered cake. Your favorite jam would go great dolloped on top of cupcakes! Oh, the possibilities are endless. I hope you enjoy it.

Blue Ribbon Recipe

This recipe jazzes up a boxed yellow cake mix that any peanut butter fan will love. The moist cake is topped with a homemade peanut butter frosting that's guaranteed to satisfy your sweet tooth. You taste peanut butter in every layer of the cake and icing. Boxes of cake mix have become smaller over the years. If you can find a 22 oz cake mix for this recipe, that will work best. If not, we suggest adding about 2 oz of flour to the cake mix otherwise the texture may be slightly off.

— The Test Kitchen @kitchencrew
(22 ratings)
yield 9 -12
prep time 10 Min
cook time 40 Min
method Bake

Ingredients For easy peanut butter cake & peanut butter frosting

  • 1 box
    yellow cake mix
  • 4
  • 1/2 c
    softened butter
  • 1 c
  • 1/2 c
    creamy peanut butter
  • 3 c
    confectioners' sugar
  • 1/2 c
    creamy peanut butter
  • 1/2 c
    softened butter
  • 2+ Tbsp
  • 1 tsp
    pure vanilla extract
  • tiny pinch

How To Make easy peanut butter cake & peanut butter frosting

  • Mixing peanut butter and butter.
    Preheat oven to 325°F. Lightly grease a 9 X 13 baking pan and set aside. Using an electric mixer, cream the butter and peanut butter until well incorporated.
  • Eggs, cake mix, and water added to peanut butter.
    Add eggs, cake mix, and water and beat on medium for two minutes.
  • Batter poured into a baking dish.
    Pour into greased baking dish.
  • Baked cake cooling.
    Bake for 40 minutes or until a toothpick comes out clean. Cool completely before frosting.
  • Creaming butter and peanut butter.
    Frosting: Cream the butter and peanut butter until well incorporated.
  • Confectioners' sugar, extract, salt, and milk added.
    Add confectioners' sugar, extract, salt, and 2 tablespoons of milk and continue to mix until the frosting is nice and fluffy.
  • Easy Peanut Butter Cake & Peanut Butter Frosting ready to be sliced.
    You may need an additional tablespoon (or more) of milk if the frosting is too thick.