Why You’ll Love these Banana Bread Brownies
Decadence in a pan, these banana bread brownies offer the best of two beloved treats. You’ll fall in love with their moist, cake-like texture and rich banana flavor, topped with a dreamy vanilla frosting that melts in your mouth.
Perfect for using up those spotty bananas sitting on your counter right now.
They’re incredibly versatile, too—serve them as a special breakfast treat, afternoon pick-me-up, or impressive dessert.
And can we talk about that heavenly aroma while they bake? Your kitchen will smell like a gourmet bakery.
Trust me, these will disappear faster than you can say “seconds, please.”
What Ingredients are in Banana Bread Brownies?
These banana bread brownies combine the best of both worlds—the comforting flavors of banana bread with the satisfying texture of brownies, all topped with a silky-smooth frosting that takes them to the next level.
I love how these treats transform those spotty bananas into something truly special. Ready to gather your ingredients? Here’s everything you’ll need:
For the Brownies:
- 1 cup (200g) granulated sugar
- 1 cup (240ml) sour cream (or plain Greek yogurt)
- ½ cup (113g) unsalted butter, softened
- 2 large eggs
- 4 ripe bananas, mashed (about 2 cups)
- 2 teaspoons pure vanilla extract
- 2 cups (250g) all-purpose flour
- 1 teaspoon baking soda
- ¾ teaspoon salt
- ½ cup (60g) chopped walnuts (optional)
For the Frosting:
- ½ cup (113g) unsalted butter
- 4 cups (480g) powdered sugar
- 1½ teaspoons pure vanilla extract
- 3 tablespoons milk (plus more if needed for spreading)
When selecting your bananas, the spottier and darker, the better—they’ll provide more natural sweetness and stronger banana flavor.
The sour cream gives these brownies their incredible moisture, but Greek yogurt works beautifully as a substitute if that’s what you have on hand.
And while the walnuts add a lovely texture contrast, feel free to leave them out if you’re baking for someone with nut allergies or preferences.
The frosting might seem like a lot of powdered sugar, but trust me, it creates that perfect balance of sweetness with the more subtly flavored brownie base.
How to Make these Banana Bread Brownies
Making these banana bread brownies is surprisingly straightforward, even when I’m juggling a million other things in the kitchen. Start by preheating your oven to 350°F (175°C) and preparing your 9×13-inch baking dish—either grease and flour it or line with parchment paper for easy removal. The parchment paper route is my go-to since it means virtually no cleanup and perfect edges every time.
In a large mixing bowl, cream together 1 cup of granulated sugar, 1 cup of sour cream, and ½ cup of softened unsalted butter until the mixture becomes light and fluffy. This creates the foundation of moisture that makes these brownies so irresistible.
Next, beat in 2 large eggs, your 4 mashed ripe bananas (about 2 cups worth), and 2 teaspoons of vanilla extract until everything is smooth and well-incorporated. Can you smell that banana goodness already?
In a separate bowl, whisk together 2 cups of all-purpose flour, 1 teaspoon of baking soda, and ¾ teaspoon of salt. Gradually add these dry ingredients to your wet mixture, mixing just until combined—overmixing is the enemy of tender brownies. If you’re using them, fold in ½ cup of chopped walnuts for that wonderful textural contrast.
Pour the batter into your prepared baking dish, spreading it evenly to the corners. Pop it into your preheated oven and bake until a toothpick inserted in the center comes out clean—typically about 25-30 minutes, though your oven might vary.
While the brownies are cooling, prepare that heavenly frosting by combining ½ cup of unsalted butter, 4 cups of powdered sugar, 1½ teaspoons of vanilla extract, and 3 tablespoons of milk. You might need a bit more milk to reach that perfect spreading consistency.
Once the brownies have cooled completely, spread that luscious frosting over the top. Waiting for them to cool is probably the hardest part of the whole recipe, but rushing this step will leave you with melted frosting, and where’s the fun in that?
Banana Bread Brownies Substitutions and Variations
Now that you’ve mastered the basic recipe, let’s explore some creative swaps and twists to make these banana bread brownies uniquely yours.
You can substitute chocolate chips for the walnuts, or go wild with a mix of dark chocolate and dried cherries. Not a fan of dairy? Coconut oil works beautifully in place of butter, and almond milk can replace regular milk in the frosting.
Try adding a teaspoon of cinnamon or a pinch of nutmeg for warmth. Feeling fancy? Swirl in some peanut butter before baking, or top with a cream cheese frosting instead.
The possibilities are endless!
What to Serve with Banana Bread Brownies
When it comes to serving these deliciously moist banana bread brownies, you’ve got plenty of options to elevate your dessert game.
A scoop of vanilla ice cream creates that perfect warm-cold contrast, while a dollop of freshly whipped cream adds lightness and a touch of elegance.
Want something more substantial? Try pairing with a hot cup of coffee or chai tea. The slight bitterness balances the sweetness beautifully.
For a breakfast twist, serve alongside fresh berries and Greek yogurt.
Feeling fancy? A drizzle of caramel sauce or chocolate ganache turns these treats into a showstopping finale to any meal.
Final Thoughts
After spending time with these banana bread brownies, you’ll understand why they’ve become such a beloved treat in so many kitchens.
The perfect marriage of two classics creates something truly special—moist, flavorful bars topped with that irresistible frosting.
What makes these so wonderful is their versatility.
Serve them warm for dessert, pack them in lunch boxes, or enjoy with your morning coffee.
The banana flavor deepens overnight, making them even better the next day.
Banana Bread Brownies
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C) and prepare a 9×13-inch baking dish by greasing and flouring it or lining it with parchment paper.
- In a large mixing bowl, cream together 1 cup granulated sugar, 1 cup sour cream, and 1/2 cup softened unsalted butter until light and fluffy.
- Beat in 2 large eggs, 4 mashed ripe bananas (about 2 cups), and 2 teaspoons pure vanilla extract until smooth and well-incorporated.
- In a separate bowl, whisk together 2 cups all-purpose flour, 1 teaspoon baking soda, and 3/4 teaspoon salt. Gradually add these dry ingredients to the wet mixture, mixing just until combined.
- Fold in 1/2 cup chopped walnuts if using. Pour the batter into the prepared baking dish, spreading it evenly to the corners.
- Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Allow the brownies to cool completely.
- While the brownies are cooling, prepare the frosting by combining 1/2 cup unsalted butter, 4 cups powdered sugar, 1.5 teaspoons pure vanilla extract, and 3 tablespoons milk. Adjust with additional milk if needed for a smooth, spreadable consistency.
- Once the brownies are completely cooled, spread the frosting evenly over the top.
