These are super moist, tender, sweet, and flavorful Banana Bread Brownies with sour cream, chopped walnuts, and mashed bananas. They have amazingly delicious frosting, which is made with butter, powdered sugar, milk, and vanilla extract.
If you have overripe bananas and you don’t know what to prepare with them, I suggest you bake these Banana Bread Brownies. The overripe bananas give brownies such a rich taste and wonderful flavor.
What do I need to make banana bread brownies?
These light, moist and sweet banana bread brownies are easy to make.
You will need simple ingredients for the banana bread brownies – sugar, sour cream, butter, eggs, bananas, vanilla extract, all-purpose flour, baking soda, salt, chopped walnuts, powdered sugar, and milk.
The full recipe and amounts can be found in the recipe card below.
How to make Banana Bread Brownies?
- Preheat the oven to 375°F. In a mixing bowl, mix together 1 ½ cups sugar, 1 cup sour cream, 1 stick (½ cup) softened butter, and 2 eggs using an electric mixer. Beat until well combined. Add 3 mashed bananas and 2 tsp vanilla extract to the batter. Mix until combined.
- Add the dry ingredients (2 cups all-purpose flour, 1 tsp baking soda, ¾ tsp salt) to the batter. Mix until combined.
- Stir in ½ cup chopped walnuts.
- Grease a 9×13 inch baking pan with non-stick cooking spray. Then, pour the banana batter into the prepared baking pan. Bake in the preheated oven for 20-30 minutes or until ready. Check the readiness of the Banana Bread Brownies using a toothpick inserted in the center, if it comes out clean – the brownies are ready. Remove the baking pan from the oven. Let it cool slightly.
- While the brownies are cooling, prepare the frosting. In a saucepan, melt 1 stick (½ cup) butter and heat until medium brown color. Turn off the heat and add 3 cups powdered sugar (1 cup at a time), stir until combined after each addition. Then, add 3 tbsp milk and 1 ½ tsp vanilla extract. Mix until combined.
- Pour the frosting over the brownies. Spread evenly. Let the banana bread brownies cool completely. Then cut and serve. Enjoy!
How long should you let banana bread brownies cool?
You just need to let the banana bread brownies cool a little so they aren’t hot, but warm.
Then you can pour the frosting over the top of the banana bread brownies and let them cool completely before cutting.
Usually, it takes about one or two hours. I prefer to let the banana bread brownies cool overnight.
Should you refrigerate banana bread brownies?
You can store these banana bread brownies for up to 3 days at room temperature and for up to 5 days in the refrigerator. Store leftover banana bread brownies in an airtight container or a sealed plastic bag.
Recipe Tips
- You can also use chocolate chips, pecans, peanuts instead of walnuts.
- Store these banana bread brownies for up to 3 days at room temperature, for up to 5 days in the refrigerator, and for up to 3 months in the freezer. Store leftover banana bread brownies in an airtight container or a sealed plastic bag.
OTHER RECIPES YOU MIGHT ENJOY
Banana Bread Brownies
Ingredients
For the banana bread brownies:
- 1 ½ cups sugar;
- 1 cup sour cream;
- ½ cup (1 stick) unsalted butter, at room temperature;
- 2 eggs, at room temperature;
- 3 bananas, mashed;
- 2 tsp vanilla extract;
- 2 cups all-purpose flour;
- 1 tsp baking soda;
- ¾ tsp salt;
- ½ cup walnuts, chopped.
For the frosting:
- ½ cup unsalted butter;
- 3 cups powdered sugar;
- 1 ½ tsp vanilla extract;
- 3 tbsp milk.
Instructions
- Preheat the oven to 375°F. Grease a 9x13 inch baking pan with non-stick cooking spray.
- In a mixing bowl, mix together sugar, sour cream, softened butter and eggs using an electric mixer. Beat until well combined. Then, add mashed bananas and vanilla extract. Mix until combined.
- Add the dry ingredients (all-purpose flour, baking soda, salt) to the batter. Mix until combined. Then, add chopped walnuts.
- Pour the banana batter into the prepared baking pan. Bake in the preheated oven for 20-30 minutes or until ready. Check the readiness of the Banana Bread Brownies using a toothpick inserted in the center, if it comes out clean - the brownies are ready. Remove the baking pan from the oven. Let it cool slightly.
- While the brownies are cooling, prepare the frosting. In a saucepan, melt butter and heat until medium brown color. Turn off the heat and add powdered sugar (1 cup at a time), stir until combined after each addition. Then, add milk and vanilla extract. Mix until combined. Pour the frosting over the brownies. Spread evenly. Let the banana bread brownies cool completel. Then cut and serve. Enjoy!
These are delicious! The icing is way too sweet for me, but I do not like super sugary icing. I think I might do a cream cheese frosting next time.
First time baking the banana bread brownies. My sister couldn’t wait for it to cool. She loves it.
These are now a ‘staple’ in my house….we ‘save’ bananas to ‘cure’ just to make this. My household is not a fan of brownie icing, so I omit that step
I made this just as the recipe reads. It was amazing. My family is wowed!! Thank you
I made this for my dinner date last night and he loved it! He said it was the best thing he has tasted. I loved it as well! Then my daughter came home with her friends and they almost ate the whole pan! It was perfect and I made no substitutions.
Amazing recipe!
Love the frosting; I also only did 2 cups of confectionery sugar;
This is my 5th time making these banana brownie recipe. To die for. My family and church were raving about them. I’m making some as I write this review for church tomorrow for mothers day. thx u for teaching a beginner how to bake. Ultimate favorite recipe
This was outstanding. I did substitute pecans for walnuts but I loved this better than banana bread every day of the week. I even made it for a friend who loves bananas and he called to tell me it was delicious. So thank you. A new favorite. 💜
I made these and brought them to work, everyone loved them exactly as the recipe was written.
Thank you for sharing
We really liked the banana bread. Next time I will only use 2 cups of powdered sugar, 3 was too sweet for me. Good brownies/bread though!
Easy and delicious! I used a can of cream cheese frosting for convenience.
I made this recipe and it was fabulous my dog ,even jumped on the counter and ate the whole cake without breaking my pan, and by just pulling the tin foil strategically over! And having a ball,will make again and only store in the oven🐾🐾😢
How wonderful, Janet! So glad you decided to give it a try!
I made this recipe and it was so delicious it came out perfect I only use 2 cups of the powder sugar and it was perfect thank you for sharing
Made this in October when I had some over ripe bananas. Truly amazing! I only used 2 c powder sugar and it was perfect! Shared with neighbors and friends, everyone said it was amazing!
Getting ready to make it a second time.
Oh my goodness you are so kind. Thank you for coming back to leave a review!
Got up early and made this recipe up this morning absolutely amazing It is very moist and delicious, it has just the right amount of nuts and makes a nice big amount. I only used one Cup of brown sugar and in the frosting I could only fit 2 cups of powdered sugar but the flavor is sweet and delicious very far superior over any kind of banana bread I’ve ever had or banana cake I’ve ever had I followed the recipe as best I could but I just tried to cut out some of the sugar and it turned out perfect and delicious thank you
Oh my goodness you are so kind. So glad you were able to customize it to your liking! Thank you for coming back to leave a review!
This was so easy to make. Used less sugar. Used over ripe bananas, Very moist. The icing piece is what makes this brownie which is more like bread.
Don’t skip the icing!
Thanks for the suggestions Linda. So glad you decided to try it again and customize it to your liking. 🙂
Everyone loves these!!
Thanks, Suzi!