It was one of those days when the bananas on my countertop were becoming too ripe to eat, and I was left wondering what to do with them. The classic choice would be banana bread, but I was craving something a bit more indulgent.
After pondering for a while, I had a lightbulb moment: Why not combine the best of banana bread with the chewy richness of brownies? I set to work on creating a hybrid dessert that had all the comforting banana bread flavor but in a portable, brownie-like form.
After a few test batches and a little tweaking, these Banana Bread Brownies were born. The result? Soft, moist banana bars topped with a nutty, brown butter glaze that makes every bite feel like a warm hug.
Short Description
Banana Bread Brownies are a delightful twist on a traditional favorite, combining the soft, rich texture of banana bread with the chewy decadence of brownies. Topped with a luscious brown butter glaze, these bars are a sweet, comforting treat perfect for any occasion.
Ingredients
- 1 ½ cups granulated sugar
- 1 cup sour cream
- ½ cup unsalted butter, softened
- 2 large eggs
- 4 ripe bananas, mashed
- 2 teaspoons vanilla extract
- 2 cups all-purpose flour
- 1 teaspoon baking soda
- ¼ teaspoon salt
Tools Needed
- 10×15-inch baking sheet
- Medium saucepan
- Mixing bowls
- Whisk
- Electric mixer or hand beaters
Cooking Instructions
Step 1: Prepare the Banana Bread Bars
Preheat your oven to 375°F (190°C) and grease a 10×15-inch baking sheet. This size ensures a thin, even layer of banana bread bars that bake up soft and chewy.
In a large mixing bowl, combine the granulated sugar, sour cream, softened butter, and eggs. Beat until smooth and creamy, making sure the mixture is well combined. The sour cream gives the bars a slight tang, which perfectly complements the sweetness of the bananas.
Step 2: Add the Bananas and Vanilla
Next, fold in the mashed bananas and vanilla extract, mixing until well combined. The overripe bananas add natural sweetness, so you don’t need to go heavy on the sugar. The vanilla gives the bars a lovely aromatic warmth.
Step 3: Mix Dry Ingredients
Stir in the all-purpose flour, baking soda, and salt, being careful not to overmix. This is crucial—overmixing can make the bars dense, and we want them to be soft and chewy. Once just combined, spread the batter evenly across the prepared baking sheet.
Step 4: Bake the Bars
Place the pan in the oven and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. The top will have a light golden brown color. Once done, remove the pan from the oven and let the bars cool slightly.
Step 5: Prepare the Brown Butter Glaze
While the bars are cooling, melt the butter in a medium saucepan over medium heat. Keep an eye on it as it cooks—it will bubble up before turning golden brown and developing a nutty aroma. This step takes about 5-7 minutes.
Once the butter is browned, remove it from the heat and whisk in the powdered sugar, vanilla extract, and milk until smooth. If the glaze is too thick, add more milk until it reaches a pourable consistency.
Step 6: Glaze the Bars
Pour the glaze over the warm banana bars, spreading it evenly with a spatula. Allow the glaze to set before cutting the bars into squares.
The rich, caramelized flavor of the brown butter glaze perfectly complements the banana base, adding an extra layer of indulgence.
Why You’ll Love This Recipe
Incredibly moist texture: Thanks to the mashed bananas and sour cream, these bars have a soft, melt-in-your-mouth consistency.
Natural sweetness: Ripe bananas lend their sweetness, so you can enjoy a dessert without feeling like it’s overly sugary.
Easy to make: With simple ingredients and minimal steps, these banana bread brownies come together quickly, perfect for a last-minute treat.
A crowd-pleaser: Whether for family gatherings, bake sales, or a weekend treat, these bars are always a hit.
Indulgent and comforting: The brown butter glaze adds a layer of richness that transforms these bars into a decadent dessert.
Mistakes to Avoid & Solutions
1. Overmixing the batter: Mixing the batter too much can make the bars dense. Stir until just combined to keep them light and fluffy.
Solution: Use gentle folding motions when incorporating the dry ingredients into the wet ingredients.
2. Underbaking or overbaking: If you bake the bars for too long, they will dry out. If you don’t bake them long enough, they might be too gooey.
Solution: Test the bars with a toothpick at the 20-minute mark and bake for 5-minute intervals if needed. The toothpick should come out clean when done.
3. Lumpy glaze: If your brown butter glaze turns out lumpy, it could be due to undissolved powdered sugar.
Solution: Whisk vigorously after adding the powdered sugar, or heat it gently while whisking to ensure it becomes smooth.
Serving and Pairing Suggestions
Serve as a snack or dessert: These banana bread brownies are perfect for an afternoon pick-me-up with a cup of coffee or tea.
Pair with ice cream: For an extra indulgent treat, serve them warm with a scoop of vanilla ice cream or whipped cream.
Top with nuts or chocolate chips: If you want a little crunch or extra sweetness, sprinkle some chopped walnuts, pecans, or chocolate chips over the glaze before it sets.
Storage and Reheating Tips
Storing: Store leftover banana bread brownies in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate them for up to a week.
Reheating: Gently warm the bars in the microwave for about 15-20 seconds for a soft, fresh-out-of-the-oven texture. You can also reheat them in the oven at 350°F for about 5 minutes.
FAQs
1. Can I use frozen bananas for this recipe?
Yes! Just thaw and mash the frozen bananas before adding them to the batter.
2. What if I don’t have sour cream?
You can substitute with Greek yogurt for a similar texture and tang.
3. Can I make this gluten-free?
Yes, substitute the all-purpose flour with a 1:1 gluten-free flour blend.
4. Can I add chocolate chips to the batter?
Absolutely! Adding ½ cup of chocolate chips to the batter will give the bars a sweet, chocolaty twist.
5. How do I prevent the glaze from becoming too thick?
If the glaze is too thick, simply add a little more milk until it reaches the right consistency.
Tips & Tricks
Use overripe bananas: The riper the bananas, the sweeter and more flavorful your bars will be. Make sure they’re speckled with brown spots.
Mix the glaze while the bars are cooling: The glaze will spread more easily when it’s warm, so make it just before the bars are done cooling.
Cut with a sharp knife: To get clean cuts, use a sharp knife or even a bench scraper to slice the bars after they’ve cooled slightly.
Recipe Variations
Nutty Banana Bread Brownies: Stir in ½ cup of chopped walnuts or pecans into the batter for added texture and a nutty flavor.
Chocolate Banana Bread Brownies: Add 1 cup of mini chocolate chips to the batter for a chocolatey twist that complements the banana flavor beautifully.
Cinnamon Spice Banana Bread Brownies: Mix in 1 teaspoon of cinnamon to the batter for a cozy, spiced flavor that works wonderfully with the banana base.
Final Thoughts
If you’re looking for a fun twist on traditional banana bread, these banana bread brownies are the perfect solution. With their tender, moist texture and decadent brown butter glaze, they’re the kind of treat that makes you feel right at home.
Whether you’re baking them for a special occasion or just because you have some overripe bananas lying around, these bars will never disappoint. So go ahead, indulge a little, and treat yourself to something truly delicious. You’ll never look at banana bread the same way again!

Banana Bread Brownies
Ingredients
- 1½ cups granulated sugar
- 1 cup sour cream
- ½ cup unsalted butter
- 2 large eggs
- 4 ripe bananas
- 2 tsp vanilla extract
- 2 cups all-purpose flour
- 1 tsp baking soda
- ¼ tsp salt
Instructions
- Preheat oven to 375°F (190°C) and grease a 10x15-inch baking sheet. In a large bowl, beat granulated sugar, sour cream, butter, and eggs until smooth and creamy.
- Fold in mashed bananas and vanilla extract until combined.
- Stir in flour, baking soda, and salt, being careful not to overmix. Spread the batter evenly in the baking sheet.
- Melt butter in a saucepan over medium heat, cooking until golden brown and nutty (about 5-7 minutes). Remove from heat and whisk in powdered sugar, vanilla, and milk until smooth. Add more milk if needed for consistency.
- Pour the glaze over the warm bars, spreading evenly. Let it set before cutting into squares.