These banana brownies are rich, fudgy, and have a signature crackly crust, with sweet ripe bananas adding natural moisture and cutting through the bitterness of the dark chocolate.
Using ripe mashed bananas in the batter naturally locks in moisture, giving these brownies an ultra-dense, chew-in-the-middle texture that stays fresh for days.
With a paper-thin, shiny crackly crust on top and deep dark chocolate in every bite, it’s the ultimate upgraded brownie recipe that comes together without needing a mixer.
They are perfect if you have ripe bananas but are sick of making banana bread. Great t
For more brownie recipes, check out my small batch brownies, Oreo brownies, Biscoff brownies, and dark chocolate brownies.
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Why this recipe works
- Simple Prep: No stand mixer or electric beaters required. All you need is a whisk and a rubber spatula for effortless prep and quick cleanup.
- Fudgy Center: Extra-ripe bananas add natural moisture and pectin, keeping the brownie centers thick, dense, and soft without making them cakey or bread-like.
- Signature Crackly Crust: Whisking the eggs and sugar for a full 3 minutes creates that classic, paper-thin crinkly top every great brownie needs.
- Perfect Flavor Balance: The natural fruit sweetness of overripe bananas cuts through the intense bitterness of Dutch-processed cocoa and 60%+ dark chocolate.
- Stays Fresh For Days: Thanks to the moisture from mashed bananas, these brownies stay soft and fudgy at room temperature for up to 4 full days.
Ingredients
Before you start to make this recipe, measure and prepare your ingredients so the cooking process will go smoothly and easily. Full measurements are in the recipe card below.
Unsalted Butter: Melted warm alongside the dark chocolate for rich flavor and that classic chewy brownie texture.
Dark Chocolate (60% or higher): High-quality baking chocolate melted directly into the warm butter forms the rich, dense chocolate base of the batter.
Granulated Sugar: Dissolves into the warm chocolate-egg mixture to build that paper-thin, shiny crackly crust.
Large Eggs: Ensure your eggs are at room temperature so they whisk smoothly into the warm melted chocolate mixture without seizing.
Pure Vanilla Extract: Complements the banana profile and rounds out the deep chocolate flavor.
Espresso Powder: Enhances and deepens the dark chocolate flavor without adding a strong coffee taste.
Kosher Salt: Balances the sweetness of the bananas and sugar while elevating the dark cocoa notes.
Ripe Bananas: Use bananas with plenty of dark brown spots. They mash smoothly, adding natural moisture and sweetness to balance the intense dark chocolate base.
Dutch-Processed Cocoa Powder: Deepens the chocolate color and creates a dark, velvety crumb.
All-Purpose Flour: Standard plain flour provides just enough structure to set the fudgy centers without turning them cakey.
Instructions
Preheat your oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal later.
In a large mixing bowl, add the butter and the dark chocolate. Melt completely in the microwave or in a Bain Marie until smooth and glossy.
Into a large mixing bowl, add the eggs and sugar. Use a whisk to whisk the eggs and sugar for 3 minutes until the mixture becomes pale and thick.
In a separate bowl, mash the ripe bananas thoroughly with a fork or masher until they turn into a completely smooth puree with no chunks remaining.
Transfer the melted chocolate and butter mixture to the egg mixture and sift in the cocoa powder. Add the vanilla extract, banana puree, salt, and espresso powder. Whisk until fully combined and smooth.
Sift the flour into the bowl and fold the mixture with a rubber spatula until the batter is almost combined. Do not overmix!
Pour the batter into your parchment paper-lined 8 by 8 brownie pan and smooth it out with an offset spatula. Bake in a 180°C (350°F) preheated oven for 30–35 minutes. Do not overbake it to keep it fudgy!
Allow the brownies to cool for at least 30 minutes before slicing so they won't crumble and fall apart. Top every slice of brownie with a fresh slice of banana before serving.
Expert Tips
- Mash Bananas into a Smooth Puree: Take an extra moment to mash the bananas until they turn into a completely smooth puree. A silky puree incorporates seamlessly into the chocolate batter without leaving heavy pockets of fruit.
- Whisk Eggs and Sugar for a Full 3 Minutes: Taking the full 3 minutes to whisk the eggs and sugar until pale and thick is the key step that builds that signature paper-thin crackly crust on top.
- Use 60% or Higher Dark Chocolate: Stick to 60% or higher dark chocolate bars for melting into the butter to keep the sweetness perfectly balanced with the banana puree.
- Don't Skip the Espresso Powder: Espresso powder is the secret ingredient that wakes up the dark chocolate notes, giving the brownies a deeper, bakery-style profile.
- Don't Overbake: Pull the pan out of the oven at the 30–35 minute mark when the center still has a tiny bit of give. Overbaking will dry out the fudgy centers.
- Cool Before Slicing: Let the brownies sit for at least 30 minutes so the melted chocolate sets. Slicing too early will cause them to crumble and fall apart.
- Add Banana Slices Just Before Serving: Place a fresh banana slice on top of each square right before serving so the fruit stays bright and fresh.
Troubleshooting & FAQ'S
Cakey brownies happen when too much flour is added or when the brownies are left in the oven for too long. Always measure flour accurately using a scale and pull them out as soon as the edges are set to keep them fudgy.
Yes! Thaw them completely at room temperature first, drain off any excess liquid, and mash them until they turn into a smooth puree before adding to the batter.
The crackly top forms when sugar dissolves into the eggs. Make sure to whisk the eggs and sugar for the full 3 minutes until pale and thick before adding the melted chocolate.
Fresh banana slices added after slicing look best when served immediately. If serving later, lightly brush the banana slices with a tiny drop of lemon juice to prevent browning.
Storing
Store cooled brownies in an airtight container at room temperature for up to 4 days, or refrigerate for up to a week.
Freezing
Wrap individual slices tightly in plastic wrap (without the fresh banana slices on top) and store in a freezer-safe bag for up to 3 months. Thaw at room temperature for 15–20 minutes before serving.
Dietary Swaps & Variations
Dairy-Free Butter: Swap the butter 1:1 with ⅔ cup melted vegan butter sticks (or coconut oil).
Dairy-Free Chocolate: Swap the dark chocolate 1:1 with 8 oz dairy-free dark chocolate (60%+ cocoa).
Gluten-Free: Swap the flour 1:1 with ½ cup 1-to-1 gluten-free baking flour (with xanthan gum). Sift in as normal.
Egg-Free: Replace 2 eggs with ½ cup unsweetened applesauce (or 2 flax eggs: 2 tablespoon ground flaxseed + 6 tablespoon water, rested for 5 minutes). Note: The top crust will be less shiny.
Coffee-Free: Omit the 1 teaspoon espresso powder or swap 1:1 with 1 teaspoon extra cocoa powder.
Equipment
- 8 by 8-inch Brownie Pan: Metal pans yield the best, crispest edges.
- Parchment Paper: For easy removal and clean slicing.
- Large Mixing Bowls: One for melting chocolate and butter, one for whisking eggs and sugar.
- Whisk & Rubber Spatula: For whisking the egg mixture and gently folding dry ingredients.
- Offset Spatula: For smoothing out the thick batter evenly in the pan.
- Fine Mesh Sieve: To sift cocoa powder and flour without lumps.
- Digital Kitchen Scale: For exact measurement accuracy.
More banana desserts
Banana Bread Cookies- Soft, bakery-style banana cookies topped with a velvety cream cheese frosting and crunchy toasted pecans.
4 Ingredient Banana Bread- An insanely easy, moist banana bread made with basic pantry staples in under 5 minutes.
Banana Chocolate Chip Cake- A moist, tender sheet cake packed with melty chocolate chips and topped with rich chocolate frosting.
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📖 Recipe
Fudgy Banana Brownies
Ingredients
- ⅔ cup Butter unsalted
- 8 oz Dark chocolate 60% or more
- 2 Eggs
- 1 cup Granulated sugar
- 2 teaspoon Vanilla extract
- 1 teaspoon Espresso powder
- ½ teaspoon Kosher salt
- ½ cup Banana ripe bananas, mashed
- ½ cup Cocoa powder Dutch-processed
- ½ cup Flour AP, plain
Instructions
- Preheat your oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal later.
- In a large mixing bowl, add the butter and the dark chocolate. Melt completely in the microwave or in a bain-marie until smooth and glossy.
- Into a large mixing bowl, add the eggs and sugar. Use a whisk to whisk the eggs and sugar for 3 minutes until the mixture becomes pale and thick.
- In a separate bowl, mash the ripe bananas thoroughly with a fork or masher until they turn into a completely smooth puree with no chunks remaining.
- Transfer the melted chocolate and butter mixture to the egg mixture and sift in the cocoa powder. Add the vanilla extract, banana puree, salt, and espresso powder. Whisk until fully combined and smooth.
- Sift the flour into the bowl and fold the mixture with a rubber spatula until the batter is almost combined. Do not overmix!
- Pour the batter into your parchment paper-lined 8 by 8 brownie pan and smooth it out with an offset spatula. Bake in a 180°C (350°F) preheated oven for 30–35 minutes. Do not overbake it to keep it fudgy!
- Allow the brownies to cool for at least 30 minutes before slicing so they won't crumble and fall apart. Top every slice of brownie with a fresh slice of banana before serving.
Notes
- Bananas: Make sure your bananas are heavily spotted or mostly brown. Very ripe bananas are sweeter, softer, and mash into a completely smooth puree, which prevents unwanted gummy pockets in the baked brownies.
- Egg & Sugar Whisking: Do not skip whisking the eggs and sugar for the full 3 minutes. This process dissolves the granulated sugar and incorporates air into the eggs, which is the exact secret to getting that thin, shiny, paper-like crackly crust on top.
- Chocolate Selection: Use dark chocolate bars with at least 60% cocoa solids. Avoid using milk chocolate or chocolate chips for melting into the butter, as they contain higher sugar levels and stabilizers that can ruin the fudgy texture and make the batter overly sweet.
- Cooling Time: Allow the brownies to cool in the pan for at least 30 minutes before lifting them out with the parchment overhang. They need this time to set properly—cutting them too early while hot will cause them to crumble and fall apart.
- Fresh Banana Topping: Place the fresh banana slices on top of each brownie square right before serving so they stay bright and appealing. If you need to slice and display them ahead of time, lightly brush the banana slices with a tiny drop of lemon juice to prevent browning.
- Measuring Flour: For the best texture, weigh your flour with a digital scale. If measuring by volume, fluff your flour with a spoon, scoop it loosely into your measuring cup, and sweep off the excess with a flat edge. Packing the flour will result in a cakey brownie.
Ben says
They turned out great.