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Peanut Butter Banana Cake

What could be better than banana bread? Peanut Butter Banana Cake, duh. 
Prep Time20 minutes
Cook Time40 minutes
Course: Dessert
Cuisine: American
Keyword: banana bread, banana cake, chocolate peanut butter, peanut butter frosting
Servings: 16 servings
Author: Sarah Crawford

Ingredients

For the Banana Cake

  • 3 very ripe bananas
  • 1/4 cup melted unsalted butter
  • 1/4 cup vegetable oil
  • 3/4 cup granulated sugar
  • 1/2 cup light brown sugar
  • 3 large eggs at room temperature
  • 1/2 cup sour cream at room temperature
  • 1 tsp pure vanilla extract
  • 1 tsp baking powder
  • 1/2 tsp kosher salt
  • 2 cups all-purpose flour

For the Peanut Butter Frosting

  • 4 oz cream cheese at room temperature
  • 1/4 cup unsalted butter at room temperature
  • 1/2 cup creamy peanut butter
  • 1 1/2 cups powdered sugar
  • 1 tsp pure vanilla extract
  • Marshmallow fluff (optional)

Instructions

For the Banana Cake

  • Preheat oven to 350°F. Line an 8-inch pan with parchment paper. Use a large fork or potato masher to mash all 3 bananas in a large bowl; set aside.
  • In a separate bowl whisk butter, oil, granulated sugar, and brown sugar until smooth. Beat in eggs, one at a time, beating well after each addition.
  • Whisk in sour cream and vanilla until smooth. Whisk in baking powder and salt.
  • Switch to a rubber spatula or wooden spoon and fold in flour until no streaks remain. Stir in mashed bananas.
  • Pour batter into prepared pan. Bake 40 to 45 minutes or until a toothpick inserted into the center of the cake comes out clean.
  • Cool cake completely in pan before removing to a wire rack. Frost when completely cooled.

For the Peanut Butter Frosting

  • Add cream cheese, butter, and peanut butter to the bowl of a stand mixer fitted with the paddle attachment. Beat on high 2 minutes.
  • Gradually add powdered sugar, beating until smooth. Beat in vanilla.
  • When the cake is completely cooled, use an offset spatula or spoon to spread the frosting on top of the cake. If desired, dollop marshmallow fluff on top of the frosting and use a toothpick or knife to swirl it into the frosting.