Description
A moist and delicious cake combining the flavors of banana and peanut butter, topped with a creamy peanut butter frosting.
Ingredients
Scale
- 2 cups all-purpose flour
- 1 teaspoon baking soda
- 1 teaspoon ground cinnamon
- 1/2 teaspoon salt
- 1 cup (2 sticks) unsalted butter, softened
- 1 cup granulated sugar
- 1/2 cup packed light brown sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 1 cup mashed ripe bananas (about 2–3 bananas)
- 1/2 cup creamy peanut butter
- 1 cup buttermilk
- 1 cup (2 sticks) unsalted butter, softened
- 3 cups powdered sugar
- 1 cup creamy peanut butter
- 1/4 cup milk, or more as needed
- 1 teaspoon vanilla extract
- Pinch of salt
- Chopped peanuts
- Banana slices
- Peanut butter cups, halved
Instructions
- Preheat oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan. You can also line the bottom with parchment paper.
- In a large bowl, whisk together the flour, baking soda, cinnamon, and salt. Set aside.
- In a separate large bowl (or stand mixer), cream together the softened butter, granulated sugar, and brown sugar until light and fluffy (3-5 minutes).
- Beat in the eggs one at a time, fully incorporating each before adding the next. Stir in the vanilla extract.
- Add the mashed bananas and peanut butter to the butter mixture and beat until well combined.
- Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk. Begin and end with the dry ingredients. So, add about 1/3 of the dry ingredients to the wet ingredients and mix until just combined. Then, add 1/2 of the buttermilk and mix until just combined. Repeat with another 1/3 of the dry ingredients, the remaining buttermilk, and finally the last 1/3 of the dry ingredients. Be careful not to overmix!
- Pour the batter into the prepared baking pan and spread it evenly.
- Bake in the preheated oven for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
- Let the cake cool in the pan for 10-15 minutes before inverting it onto a wire rack to cool completely.
- In a large bowl (or stand mixer), cream the softened butter until smooth and fluffy (2-3 minutes).
- Gradually add the powdered sugar, one cup at a time, beating well after each addition. Start on low speed.
- Add the peanut butter and beat until well combined.
- Gradually add the milk, one tablespoon at a time, until the frosting reaches your desired consistency. Stir in the vanilla extract and salt.
- Beat the frosting on medium-high speed for 2-3 minutes, until light and fluffy.
- Once the cake is completely cool, spread the peanut butter frosting evenly over the top.
- If desired, garnish with chopped peanuts, banana slices, or halved peanut butter cups.
- Slice the cake into squares and serve. Enjoy!
Notes
- Make sure the butter is softened for both the cake and the frosting for best results.
- Don’t overmix the cake batter, as this can lead to a tough cake.
- The amount of milk needed for the frosting may vary depending on the humidity and the consistency of your peanut butter.
- Store leftover cake in an airtight container at room temperature or in the refrigerator.
- Prep Time: 25 minutes
- Cook Time: 35 minutes