Banana Bread Brownies combine two timeless treats into one satisfying bite. These baked delights bring together the tender richness of banana bread with the dense, fudgy texture of classic brownies. In this recipe, ripe bananas, tangy sour cream, and carefully browned butter work in harmony to create a balanced flavor profile. You will find step-by-step instructions, variations for creative twists, and tips to store your leftovers so that every bite feels as fresh as the first.
Overview
Banana bread is known for its moist crumb and sweet fruit flavor. Brownies, on the other hand, are loved for their fudgy consistency and intense taste. By merging these two, you get a dessert that is both comforting and unexpected.
This recipe is ideal whether you are serving it at breakfast, a mid-day snack, or dessert after dinner. I appreciate how this recipe reinvents a classic favorite with a small twist – the brown butter frosting. It adds a layer of nutty depth that makes these treats remarkable.

This article will cover:
– The essential ingredients and their roles.
– A detailed walkthrough of the preparation process.
– Tips and variations to customize your brownies.
– Guidance on ripening bananas and storing your baked goods.
Ingredients
A successful recipe begins with quality ingredients. In this recipe, every component plays a crucial part. Below is a detailed list divided into sections that correspond to the brownie base and the brown butter frosting.
For the Banana Bread Brownies
-
Granulated Sugar
Provides sweetness and tenderness while balancing the flavor. -
Sour Cream
Adds moisture and a slight tang that deepens the flavor profile. -
Butter
The key fat that enriches texture and helps the brownies remain soft. -
Eggs
Bind the ingredients and offer structure to the batter. -
Ripe Bananas
The star ingredient. They add natural sweetness and ensure the crumb stays moist. Ensure your bananas are well-ripened to maximize flavor. -
Vanilla Extract
Enhances the inherent flavors of banana and butter. -
All-Purpose Flour
Provides structure, ensuring the brownies are neither too dense nor too airy. -
Baking Soda and Salt
They help leaven the mixture and enhance all the flavors. -
Chopped Walnuts (Optional)
For a nutty crunch that contrasts the soft, moist batter. You can skip or switch them with other nuts as preferred.
For the Brown Butter Frosting
-
Butter
Begin by browning the butter. This process unlocks nutty, caramel flavors that make the frosting unique. -
Powdered Sugar
Sweetens and smooths the frosting while creating a spreadable texture. -
Vanilla Extract
Adds a refined, aromatic note that pairs well with brown butter. -
Milk
Adjusts the frosting consistency, ensuring it glazes evenly over warm brownies.
Equipment
Before you start, make sure you have these essential tools:
– A large mixing bowl and a rubber spatula for stirring.
– An electric mixer (optional) to speed up the creaming process.
– A measuring cup and spoons for accuracy.
– A baking pan lined with parchment paper.
– A saucepan for browning the butter.
– A cooling rack to let the brownies cool evenly.
Step-by-Step Preparation
This recipe is designed to be straightforward and rewarding. Follow the detailed steps below for consistent results.
Preparation Steps
-
Preheat and Prepare
Preheat your oven to 375°F (190°C). Line your baking pan with parchment paper for easy removal of the brownies. This step creates a non-stick surface and promotes even baking. -
Mix Wet Ingredients
In a large bowl, add granulated sugar, sour cream, and softened butter. Beat these together until you achieve a smooth and creamy mixture. Then, add eggs one at a time and mix well after each addition. Stir in the mashed ripe bananas and a dash of vanilla extract. Mix until everything is well incorporated, but do not overbeat. -
Combine Dry Ingredients
In another bowl, whisk together all-purpose flour, baking soda, and salt. Slowly fold the dry ingredients into your wet mixture. Use a rubber spatula and gently incorporate the flour. Aim for a uniform mix while preserving the tender texture. -
Add Nuts
Once the batter is smooth, gently fold in chopped walnuts if using. Their crunchy texture contrasts with the soft baked base. -
Bake
Pour the batter into the prepared pan, smoothing the top with your spatula. Slide the pan into the preheated oven and bake for 30-35 minutes. The top should appear golden, and a toothpick inserted in the center will come out with a few moist crumbs. -
Cool and Prepare Frosting
Remove the brownies from the oven and let them cool in the pan for about 10 minutes. While cooling, prepare the frosting.
Making the Brown Butter Frosting
-
Brown the Butter
In a small saucepan over medium heat, melt the butter slowly. Allow it to simmer until you notice a slight nutty aroma and it develops a light brown color. Keep a close eye on it to prevent burning. Once browned, remove from heat and let it cool to room temperature. -
Mix the Frosting
In a medium bowl, combine the cooled brown butter with powdered sugar. Add a splash of vanilla extract and a bit of milk. Whisk until smooth. The frosting should be creamy yet thick enough to spread. Adjust milk quantity gradually if you prefer a thinner consistency. -
Frost the Brownies
Once the brownies have cooled slightly, spread the frosting evenly over the top. This step seals in moisture and elevates the flavor profile of your brownies.
Tips & Variations
Enhance your banana bread brownies using these creative ideas:
-
Chocolate Twist
Swap out walnuts for 2/3 cup of dark or semi-sweet chocolate chips. Mix the chips into the batter to inject a subtle burst of chocolate. -
Eggless Option
Replace each egg with one flax egg. To make a flax egg, mix 1 tablespoon flaxseed with 3 tablespoons water and let it sit for 5 minutes. Alternatively, use an extra 1/4 cup of mashed ripe banana. -
Reduced Sugar Version
Use half the amount of granulated sugar and substitute sour cream with Greek yogurt. This change creates a tangier flavor and slightly denser crumb. -
Gluten-Free Variation
Use a 1:1 gluten-free flour blend in place of all-purpose flour. This version caters to those with gluten sensitivities without sacrificing texture. -
Additional Nuts
Mix in almonds, pecans, or a mix of your favorite nuts. Sprinkle some extra nuts on top before baking for added crunch. -
Spiced Flavor
Add a teaspoon of cinnamon or even a pinch of nutmeg to the batter. The subtle spices bring extra warmth to the overall flavor. -
Alternative Frosting
Consider swapping the brown butter frosting with a cream cheese frosting for a tangy, rich topping. Alternatively, drizzle a bit of caramel syrup over the finished brownies for an extra luxurious touch.
How to Ripen Bananas Quickly
If your bananas are not ripe, you can speed up the process using this method:
– Oven Method:
Preheat your oven to 250°F (120°C). Place unpeeled bananas on a parchment-lined baking sheet. Bake for about 20 minutes, turning them halfway through. Cool completely before mashing. This method softens the fruit and intensifies its sweetness.
- Paper Bag Method:
Alternatively, place the bananas in a paper bag with an apple or tomato. The ethylene gas these fruits emit will help ripen the bananas naturally over 1-2 days.
Storing and Freezing
To enjoy your banana bread brownies later, proper storage is key.
Storing at Room Temperature
- Cool Completely
Allow the brownies to cool completely in the pan. This prevents condensation and potential sogginess. - Airtight Container
Place the brownies in an airtight container. They should stay fresh at room temperature for up to four days. - Layering with Parchment
If frosting is applied, place parchment paper between layers to prevent sticking.
Freezing Instructions
- Freeze Individually
Cut the brownies into squares. Arrange them in a single layer on a baking sheet and freeze until solid. This step keeps them from sticking together. - Transfer to Container
Once frozen, transfer brownies to a freezer-safe container or bag. You can also insert parchment paper between layers. - Thawing
Thaw in the fridge overnight or let them relax at room temperature for 1-2 hours before serving. Freeze for up to four months to maintain optimal taste and texture.
The Appeal of Banana Bread Brownies
I find that these brownies are more than just a dessert. They represent a comfortable, home-baked surprise on any occasion. With a combination of wholesome ingredients and a unique brown butter frosting, you can elevate a familiar favorite into something extraordinary. Whether you are sharing them with friends or serving them during a quiet moment of self-care, Banana Bread Brownies deliver satisfaction with each bite.
These enjoyable treats also serve as a great platform for experimentation. Whether you decide to add a twist with spices or nuts or opt for a different frosting, you’ll appreciate the versatility of this recipe. Each ingredient works together to build layers of flavor—simple but effective.
Baking comes from both art and science. By choosing the right ingredients, following careful techniques, and allowing your creativity to shine, you can create delicious Banana Bread Brownies that stand out. I encourage you to explore the variations and storage tips shared in this article, and to experiment with your favorite flavors.
Try the recipe as directed, then tweak it based on your own tastes. Enjoy the balance of sweet bananas and rich brown butter, and share with others who appreciate a well-crafted treat. Remember, great recipes are best when they are shared.
Happy baking, and may your kitchen be filled with the inviting aroma of freshly baked Banana Bread Brownies!

Banana Bread Brownies
These banana bread brownies with brown butter frosting are so addictive! Learn the easy recipe. Prepare to be hooked.
Ingredients
- 3/4 teaspoon salt
- 1 1/2 teaspoons vanilla extract
- 1/2 cup butter, softened
- 1/2 cup chopped walnuts
- 3-4 cups powdered sugar
- 1 cup sour cream
- 2 teaspoons vanilla extract
- 2-3 tablespoons milk
- 2 large eggs
- 1 1/2 cups granulated sugar
- 3-4 ripe bananas, mashed
- 2 cups all-purpose flour
- 1/4 cup butter
- 1 teaspoon baking soda
Instructions
- Preheat the oven to 375 degrees Fahrenheit. Grease a 9x13-inch pan with cooking spray. Line the pan with parchment paper, leaving an overhang on the sides.
- Beat the sugar, sour cream, softened butter, and eggs in a large bowl until creamy. Next, mix in the bananas and vanilla.
- Sift in the flour, baking soda, and salt. Mix carefully with a spatula until they are well combined. Then, mix in the walnuts.
- Spread the batter evenly into the prepared pan. Bake it for 30-35 minutes. Check for a golden brown color. Allow it to cool in the pan for 10 minutes before frosting and serving.
- While the brownies cool, make the frosting. Heat the butter in a large pan over medium heat. Allow it to boil and brown, stirring frequently. Remove the pan from the heat. Transfer the browned butter to a large bowl.
- To the bowl, add half of the powdered sugar, vanilla, and milk. Whisk the mixture until smooth. Add more powdered sugar as needed. Spread the frosting over the warm banana bread brownies. Serve them and enjoy!