Banana Bread Brownies

Banana bread brownies are moist, airy, and filled with banana goodness. They are topped with fluffy buttercream frosting!

These are admittedly nothing like a regular brownie—they’re more like Banana Bread in bar form, lathered with a Vanilla Buttercream that has hints of cinnamon! In fact, they’re extremely similar to our well-loved Frosted Banana Bars.

frosted banana bread brownies on parchment paper

Frosted banana brownies

I love me some sweet breads! They are comforting and oh so delicious. They are also crazy easy to make and require no yeast. Banana bread is one of my favorite sweet breads, and I can never have too many variations of it!

We’ve done Chocolate Chip Banana Bread, Cream Cheese Banana Bread, Peanut Butter Banana Bread, and now we’re putting banana bread into brownie form! Not to mention we then slathered frosting on top for good measure!

These brownies are perfect for serving and sharing and they are sure to be loved by all!

batter in a white baking dish

Making Banana Bread Brownies

PREP. Preheat the oven to 375. Grease or line with parchment a 9 x 13 baking pan.

BATTER. In a large bowl, beat together the sugar and butter. Add the sour cream, eggs, mashed bananas, and vanilla, and blend until smooth. Add the flour, baking soda, and salt, and mix to combine.

BAKE. Pour the mixture into the prepared pan. Bake 35-40 minutes, until the brownies are lightly browned on top and a toothpick inserted in the center comes out clean. Let cool completely before frosting.

Making the Frosting

MELT. To make the frosting, add the butter to a medium skillet. Melt the butter over medium low heat, stirring gently, until foamy. Watch carefully for the butter to turn a light brown color, then remove from heat and immediately pour the butter into a large bowl or the bowl of a stand mixer.

BEAT. Add the powdered sugar and vanilla to the bowl, and mix to combine. With the mixer on low speed, add the milk to form a smooth and creamy frosting. Beat on high speed for 3-5 minutes, until light and fluffy. Spread the frosting over the cooled brownies, then sprinkle with cinnamon.

Topping Ideas

We topped these banana brownie bars with a delicious layer of frosting, but they can easily be eaten plain. You can also get your baking creativity flowing and make your own little changes. Some variations include:

  • Chopped walnuts- incorporate with in the batter before baking, or sprinkle chopped nuts on top
  • Caramel syrup
  • Chocolate chips
  • Add sliced bananas on top- be sure to add right before serving otherwise they’ll brown
  • Use Cream Cheese Frosting
cooked banana bread brownies in a white baking dish

Ripen Your Bananas

This recipe calls for overripe bananas. The banana peel should be covered with brown and be very soft to the touch. If you don’t have ripe bananas on hand you can create your own by using the oven to soften and sweeten them.

  1. Preheat the oven to 250°F and line a baking sheet with parchment paper. 
  2. Place the unpeeled bananas on a sheet and bake for 10 minutes. 
  3. Flip them over and bake for another 10 minutes.
  4. Allow bananas to cool before peeling and mashing them.
banana bread brownies topped with buttercream frosting and cinnamon

Storing Info

STORE frosted banana brownies at room temperature. When stored in an airtight container they can last for up to 5 days.

FREEZE brownies without frosting. Wrap the brownies before or after cutting them in plastic wrap and again with foil. If you want to freeze them with frosting you’ll want to flash freeze them first then transfer them to a freezer safe Ziploc.

brownies stacked on a white plate and topped with frosting

for More BANANA TREATS, TRY:

Banana Bread Brownies Recipe

5 from 6 votes
Banana bread brownies are moist, airy, and filled with banana goodness. They are topped with fluffy buttercream frosting!
Course Dessert
Cuisine American
Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings 12
Calories 505 kcal
Author Lil’ Luna

Ingredients

for the brownies:

  • 1 ½ cups sugar
  • ½ cup butter softened
  • 1 cup sour cream
  • 2 large eggs
  • 3-4 ripe bananas mashed
  • 2 teaspoons vanilla
  • 2 cups flour
  • 1 teaspoon baking soda
  • ¾ teaspoon salt

for the frosting:

  • ½ cup butter
  • 3 cups powdered sugar
  • 1 teaspoon vanilla
  • ¼ cup milk or half and half
  • ground cinnamon

Instructions
 

  • Preheat the oven to 375. Grease or line with parchment a 9 x 13 baking pan.
  • In a large bowl, beat together the sugar and butter. Add the sour cream, eggs, mashed bananas, and vanilla, and blend until smooth. Add the flour, baking soda, and salt, and mix to combine.
  • Pour the mixture into the prepared pan. Bake 35-40 minutes, until the brownies are lightly browned on top and a toothpick inserted in the center comes out clean. Let cool completely before frosting.
  • To make the frosting, add the butter to a medium skillet. Melt the butter over medium low heat, stirring gently, until foamy. Watch carefully for the butter to turn a light brown color, then remove from heat and immediately pour the butter into a large bowl or the bowl of a stand mixer.
  • Add the powdered sugar and vanilla to the bowl, and mix to combine. With the mixer on low speed, add the milk to form a smooth and creamy frosting. Beat on high speed for 3-5 minutes, until light and fluffy. Spread the frosting over the cooled brownies, then sprinkle with cinnamon.

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About the Author

Kristyn Merkley

My name is Kristyn and I’m the mom of SIX stinkin’ cute kids and the wife to my smokin’ hot hubby, Lo. My mom’s maiden name is Luna, and I’m one of the many crafty “Lil’ Lunas” in the fam. On this site I like to share all things creative - from recipes to home decor to gifts and home decor ideas. Welcome!

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Comments:

  1. 5 stars
    Why have I not made these sooner?? They are to die for!! Loving the frosting on too. It takes these to a whole new level!

  2. 5 stars
    I love making banana bread with my overripe bananas. I don’t think it’s quite the fudgy texture of a brownie, but it’s not cakey like bread either. Overall it was really good and a delicious alternative to traditional banana bread.

  3. 5 stars
    Ok I could not stop eating this, how is it so addicting?! This recipe is incredible, I will definitely be using it over and over again!

  4. 5 stars
    Thank you so much for this amazing banana bread brownies recipe! Tasted really delicious and very easy to make! Highly recommended!