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Chocolate Chip Banana Cake with Peanut Butter Frosting

6 Reviews

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it’s the ultimate peanut butter banana treat.

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.

Hi there! It’s Fiona from Just So Tasty!

Do you love peanut butter as much as I do? If yes – then today’s a great day. Because today I’m sharing this chocolate chip banana cake with peanut butter frosting. The moist banana cake is flavorful and filled with mini chocolate chips. Then it’s frosted with peanut butter frosting – and decorated with Reese’s Peanut Butter cups, chocolate chips & chocolate drizzle.

The banana cake has a delicious mellow flavor that pairs perfectly with the salty peanut butter and sweet chocolate chips. And since we’re making it in a 9×13 inch pan, it feeds a crowd and it’s simpler than making a layer cake.

Can Cake Batter be Frozen?

Not all cake batters can be frozen, though. If a cake batter is leavened with whipped egg whites, like a chiffon or sponge cake, the freezing process will ruin the batter.

Creaming method cake batters, or quick bread batters that employ oil as the fat, freeze beautifully.

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.

Can You Use Cake Flour Instead of All Purpose Flour?

To substitute cake flour for all-purpose flour use 1 cup plus 2 tablespoons cake flour for every cup of all-purpose flour.

The recipe idea actually started because I had a bunch of brown bananas. (I never finish bananas before they go brown – but it’s the perfect excuse to bake.) I thought about making Banana Cupcakes, but I was craving peanut butter.

And nothing goes better with peanut butter than chocolate.

So – this chocolate peanut butter banana cake was born.

The cake is perfectly moist and flavorful for a few main reasons:

  • We’re using a combination of brown sugar and granulated sugar. The brown sugar actually adds moisture, and a delicious caramel undertone in baking.
  • Bananas sweeten the cake naturally, and make the cake extra moist.
  • Then sour cream and buttermilk give the cake a super soft crumb.

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.

The batter is thick – so make sure your butter, eggs, sour cream and buttermilk are room temperature before getting started for easier mixing.

Why Do Cakes Fall?

If there is too little moisture in a cake, it can fall in the center.

However, too much moisture can also affect a cake.

Cakes can sink because of too much leavening or, not enough leavening.

Cakes cook from the outside in, and therefore sometimes a cake can look done on the outside, however it’s still under cooked or raw in the middle.

When this happens, the raw batter sinks into the cake creating a hole.

Over-mixing  strengthens the gluten structures too much and creates more air which causes the cake to rise and then fall again.

Opening and closing the oven dramatically affects the overall cooking temperature which prevents the cake from cooking evenly and can cause it to sink.

After the cake is done baking and fully cooled, it’s time to frost. The peanut butter frosting is creamy, smooth, and not overly sweet. Depending on how much frosting you like, you might have a little leftover. But I don’t think you’ll get complaints about extra frosting….

Can You Freeze Peanut Butter Frosting?

Leftover frosting can be eaten with a spoon kept in an air-tight container in the refrigerator for up to 3 days.

Or you can freeze it for up to 1 month.

Just leave the frosting at room temperature until softened.

To decorate I used Reese’s Peanut Butter Cups, a handful of mini chocolate chips and a drizzle of melted chocolate. The toppings make the cake feel a little fancier – so they’re perfect for dressing it up and adding more peanut butter chocolate deliciousness.

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.

So if you have leftover bananas – and love peanut butter – this chocolate chip banana cake with penaut butter frosting is definitely for you!

Chocolate Chip Banana Cake with Peanut Butter Frosting

Raised in the Kitchen - Carrian Cheney

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Chocolate Chip Banana Cake with Peanut Butter Frosting

4.84 from 6 votes
Prep Time: 10 minutes
Cook Time: 55 minutes
Total Time: 1 hour 5 minutes
Servings: 20
This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.


For the Banana Chocolate Chip Cake

  • 1 and 1/2 cup brown bananas mashed very well (you'll need 3-4 bananas)
  • 2 and 3/4 cup all-purpose flour
  • 1 teaspoon baking soda
  • 1 teaspoon baking powder
  • 1/2 teaspoon salt
  • 3/4 cup unsalted butter softened to room temperature
  • 1 cup granulated sugar
  • 1/2 cup packed brown sugar
  • 3 large eggs room temperature
  • 2 teaspoons vanilla
  • 1/2 cup sour cream room temperature
  • 1 cup buttermilk room temperature*
  • 1 cup mini chocolate chips

For the Peanut Butter Frosting

  • 1/2 cup unsalted butter softened to room temperature
  • 1 cup smooth peanut butter not natural, homemade or whipped
  • 2 cups powdered sugar sifted
  • 3-4 tablespoons milk or cream

For the Decorations

  • 1/3 cup mini chocolate chips
  • 10-12 Miniature Reese's Peanut Butter Cups cut into pieces
  • Handful of mini chocolate chips


  • Make the Banana Cake
  • Preheat the oven to 350F degrees.
  • Grease and flour the bottom and sides of a 9x13 inch baking pan, set aside.
  • First mash your bananas very well until smooth - I like to use a food processor for this.
  • Then measure out 1 and 1/2 cups. This is how much you'll use.
  • In a medium-sized bowl, whisk together the flour, baking soda, baking powder and salt, then set aside.
  • In a separate large bowl using a hand-held or stand electric mixer on medium speed, beat together the butter and sugars until light and fluffy and no butter lumps remain (about 2 minutes).
  • Add in the eggs and vanilla and continue mixing.
  • Then turn the mixer down to low speed and beat in the sour cream and 1 and 1/2 cups of mashed bananas.
  • With the mixer on low speed carefully beat in the flour mixture and buttermilk about 1/2 at a time. You may need to turn off the mixer and scrape down the sides of the bowl as necessary.
  • Finally, turn off the mixer, and fold in the mini chocolate chips using a large wooden spoon or rubber spatula.
  • Pour / spoon the batter into your prepared pan and bake for 45-55 minutes or until an inserted toothpick comes out clean and you can start to see the edges just pull away from the sides of the pan.
  • Oven times vary, so watch carefully starting around the 45 minute mark. Allow the cake to cool fully before frosting.
  • Make the Peanut Butter Frosting
  • In a large bowl using a stand or hand-held electric mixer, beat the butter on medium speed until softened.
  • Then add in the peanut butter and continue beating until smooth.
  • Turn down the mixer to low speed and slowly add in the powdered sugar.
  • Once the mixture starts getting thick, add in the cream or milk 1 tablespoon at a time while beating until you get the desired consistency.
  • To Decorate the Cake
  • Make the chocolate glaze by melting 1/3 cup mini chocolate chips in the microwave in short 30 second bursts, stirring between each 30 period.
  • Then using a flat edge knife, frost the cake with the peanut butter frosting.
  • Sprinkle with peanut butter cups and chocolate chips, and drizzle the cake with the melted chocolate chips.


*If you don't have buttermilk, add 2 teaspoons of white vinegar to a measuring cup. Then fill with milk to the 1 cup line and allow to sour for 5 minutes before using. **Leftovers can be stored in an air-tight container at room temperature for 2 days, or in an air-tight container in the fridge for up to 4 days.
Nutrition Facts
Chocolate Chip Banana Cake with Peanut Butter Frosting
Amount Per Serving (1 g)
Calories 344 Calories from Fat 189
% Daily Value*
Fat 21g32%
Saturated Fat 11g69%
Cholesterol 61mg20%
Sodium 219mg10%
Potassium 142mg4%
Carbohydrates 36g12%
Fiber 1g4%
Sugar 31g34%
Protein 5g10%
Vitamin A 473IU9%
Vitamin C 1mg1%
Calcium 54mg5%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.

This chocolate chip banana cake with peanut butter frosting starts with a super moist banana cake. it's the ultimate peanut butter banana treat.

Head on over to my blog, or connect on social media for more tasty treats & desserts!

Fiona Dowling - Blogger at JustSoTasty.com

Blog | Facebook | Pinterest | Instagram | Twitter

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Our Family’s Christmas Favorites! 🎄

About the authors

carrian feik cheney oh sweet basil

Cade and Carrian have three children and love to spend time together whether it’s vacationing or snuggled up on the couch for a good movie.

And this family especially loves to eat.

They love everything from the keep you fit and healthy to the get out your sweat pants indulgent and everything in between.

But most of all, they love the memories made, shared and treasured and it’s all thanks to a meal shared together with loved ones.

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Recipe Rating


  • Delicious! I subbed 1 cup coconut sugar for the sugar and thought it was still sweet enough with the bananas. I also used milk chocolate chips, which helped with a little added sweetness as well. I will make this again and again!

    • Reply
    • Love to hear this Chris! Thank you so much!

      • Reply
  • OMG! This looks insane! Can I make it into cupcakes!?

    • Reply
    • I haven’t tried it myself, so I’m not sure of the results. You’d want to fill each cupcake paper about 1/2 to 2/3 full, and I think they’d bake for about 18-22 minutes. For the frosting, if you want to pipe it on, you’d likely want to add about 1/2 to 1 cup more of powdered sugar so it’s a little thicker. Hope this helps!

      • Reply
  • Oh. My. Gosh. This is seriously everything I love in a dessert compiled into one beautiful cake! So stinking excited to try this!

    • Reply
    • Always good to find another peanut butter chocolate lover! Let me know what you think of the cake 🙂

      • Reply
  • Oh boy, we certainly cannot go wrong with these ingredients 🙂

    • Reply
    • I completely agree! I hope you love the recipe 🙂

      • Reply

Our Family’s Christmas Favorites! 🎄