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Peanut Butter Cup Banana Cake

This cake is simple to prepare and the combo of a moist banana cake with creamy peanut butter frosting is awesome. Everyone is going to love it!
Course Cake, Dessert
Cuisine American
Keyword Banana Cake, Peanut Butter Cups, Peanut Butter Frosting, Reese's Peanut Butter Cups
Servings 12
Author Pam


  • 1 cup all purpose flour
  • 1/2 tsp baking soda
  • 1/4 tsp fine sea or kosher salt
  • 1/4 cup unsalted butter at room temperature
  • 3/4 cup granulated sugar
  • 1/4 cup light brown sugar lightly packed
  • 1 large egg
  • 1/2 cup regular or light sour cream,(not fat free for this recipe) plain Greek yogurt works too
  • 1 tsp vanilla extract
  • 3/4 cup mashed very ripe bananas
  • 1/2 cup or more Reese's Peanut Butter Cups chopped and mixed with 1 tsp flour

Peanut Butter Cup Frosting

  • 1/4 cup unsalted butter at room temperature
  • 1/3 cup creamy peanut butter
  • 1 1/2 cups sifted powdered sugar
  • 1/4 to 1/3 cup milk
  • 1 tsp vanilla extract
  • 1/2 to 1 cup peanut butter cups crumbled, make them all different sizes for a rustic look


  1. 1.Preheat oven to 350 degrees. Grease an 8×8 or 9×9 glass square pan, set aside.

    2.In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.

    In a large bowl, cream together the butter and sugars until creamy and smooth. Beat in the egg, then stir in sour cream or yogurt with vanilla extract. Mix in the mashed bananas.

    3.Slowly add the dry ingredients and mix until flour is well incorporated. Toss the peanut butter cups and gently mix in. Spread cake batter evenly into the prepared pan.

    4.Bake for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean or with moist to dry crumbs. Allow cake to cool completely on wire rack.

    5.While the cake is cooling, make the peanut butter frosting. In the bowl of a stand mixer, or using a hand held mixer, beat the butter and peanut butter on high until smooth. Slowly add the powdered sugar, Beat on high until powdered sugar is incorporated. Add the milk and vanilla extract. Beat until frosting is smooth.

    6.Frost the cake then sprinkle the crumbled peanut butter cups on top. Store on counter for one day or in fridge up to 3 days.

    Enjoy the milk chocolate peanuty deliciousness!