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A slice of peanut butter banana cake with a layer of peanut butter filling, topped with a glossy layer of chocolate ganache, showcasing the moist texture of the cake and the rich filling.

Peanut Butter Banana Cake

A moist Peanut Butter Banana Cake topped with creamy peanut butter frosting and a decadent chocolate ganache swirl.
5 from 1 vote
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings: 16 Slices
Calories: 344kcal
Course: Dessert
Cuisine: American
Keyword: banana cake, chocolate ganache, cream cheese frosting, peanut butter banana cake, peanut butter cream cheese frosting
Cost: $8

🛒 Ingredients

Banana Cake:

  • 2 large bananas very ripe about 1 cup mashed
  • 6 tablespoons unsalted butter melted adds richness to the batter
  • ½ cup dark brown sugar for a deeper sweetness
  • cup granulated sugar for sweetness balance
  • 2 large eggs room temperature helps with even mixing
  • 3 tablespoons vegetable oil adds moisture
  • teaspoons vanilla extract for flavor
  • ½ cup buttermilk adds tenderness see note
  • cups all-purpose flour for structure
  • ¾ teaspoon baking soda helps the cake rise
  • ½ teaspoon baking powder adds fluffiness
  • ½ teaspoon salt enhances flavor
  • teaspoons cinnamon adds warmth
  • ¼ teaspoon nutmeg adds a cozy spice note

Peanut Butter Cream Cheese Frosting:

  • 4 oz. cream cheese cold block full fat for creaminess
  • 4 tablespoons unsalted butter room temperature for smooth frosting
  • ½ cup creamy peanut butter for peanut flavor
  • ¼ teaspoon salt balances sweetness
  • cups powdered sugar for smoothness and sweetness

Chocolate Ganache:

  • 2 oz. chocolate chips for the ganache
  • 2 oz. heavy cream to melt with the chocolate

📋 Instructions

  • Preheat the oven to 350℉ and line an 8x8 baking pan with parchment paper.
  • Mash the bananas and set aside.
  • In a medium bowl, combine flour, baking powder, baking soda, salt, cinnamon, and nutmeg. Mix well and set aside.
  • In a large bowl, mix the melted butter and sugars until smooth. Then, add eggs, oil, and vanilla extract. Mix until combined. Add mashed bananas and buttermilk, and mix until fully incorporated.
  • Sift the dry ingredients into the wet ingredients and mix until just combined, being careful not to overmix.
  • Pour the batter into the prepared pan and bake for 30-35 minutes, until a toothpick inserted into the center comes out clean. If necessary, cover the cake with foil to prevent over-browning.
  • Allow the cake to cool completely in the pan.
  • In a medium bowl, beat the cream cheese and butter together until smooth and creamy, about 3 minutes. Add peanut butter and continue beating for another minute. Then, gradually add powdered sugar, half a cup at a time, beating until smooth and well-combined.
  • Once the cake is fully cooled, spread the frosting evenly over the top.
  • In a small microwave-safe bowl, heat the heavy cream in the microwave for 15-30 seconds until hot but not boiling.
  • Add the chocolate chips to the hot cream, allowing it to sit for a few minutes. Stir to combine until completely smooth. If necessary, microwave for 10-second intervals until fully melted and smooth.
  • Drizzle or swirl the ganache over the peanut butter cream cheese frosting. If there’s extra, serve it on the side.

📝 Notes

This peanut butter banana cake is rich and moist, perfect for any celebration or simply as a special treat. The chocolate ganache adds a sweet finishing touch to the creamy peanut butter frosting.

🥗 Nutrition

Serving: 1Slice | Calories: 344kcal | Carbohydrates: 40g | Protein: 5g | Fat: 19g | Saturated Fat: 9g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 6g | Trans Fat: 0.3g | Cholesterol: 51mg | Sodium: 273mg | Potassium: 164mg | Fiber: 1g | Sugar: 27g | Vitamin A: 418IU | Vitamin C: 1mg | Calcium: 47mg | Iron: 1mg