🍌🍫 Banana Walnut Brownie Bars
Fudgy, intensely chocolatey, and wonderfully moist, these Banana Walnut Brownie Bars combine ripe banana sweetness with rich cocoa and buttery toasted walnuts. The centers stay soft and gooey while the edges develop a delicate crispness, making these bars the perfect cross between banana bread and a classic brownie.
⏱ Recipe Information
Prep Time: 15 minutes
Bake Time: 25–30 minutes
Cooling Time: 30 minutes
Total Time: About 1 hour 15 minutes
Yield: 12–16 bars
Difficulty: Easy
🛒 Ingredients
🍫 For the Brownie Bars
- 1 cup (225 g) mashed ripe bananas — about 2–3 medium bananas
- ½ cup (113 g) unsalted butter, melted and slightly cooled
- ¾ cup (150 g) granulated sugar
- ½ cup (45 g) unsweetened cocoa powder
- 1 large egg
- 1 teaspoon vanilla extract
- ¾ cup (95 g) all-purpose flour
- ½ teaspoon baking powder
- ¼ teaspoon salt
- ¾ cup (85 g) chopped walnuts
✨ Optional Topping
- ¼ cup extra chopped walnuts
- ¼ cup chocolate chips
- Flaky sea salt, for finishing
Instructions
🔥 1. Prepare the Oven & Pan
Preheat your oven to 350°F (175°C).
Line an 8-inch square baking pan with parchment paper, leaving some overhang on two sides to make the bars easy to lift out later.
Lightly grease the parchment.
🍌 2. Mash the Bananas
Place the ripe bananas in a large mixing bowl.
Mash thoroughly with a fork until mostly smooth.
A few tiny banana pieces are perfectly fine.
The riper the bananas, the sweeter and more flavorful your brownie bars will be.
🧈 3. Add the Melted Butter
Pour the melted butter into the mashed bananas.
Whisk until well combined.
Make sure the butter has cooled slightly before adding the egg.
🥚 4. Add Sugar, Egg & Vanilla
Add:
- Granulated sugar
- Egg
- Vanilla extract
Whisk until smooth and evenly combined.
The mixture should look glossy and slightly thick.
🍫 5. Add the Cocoa
Sift the cocoa powder into the wet mixture.
Stir until completely incorporated.
Sifting helps prevent dry cocoa lumps and creates a smoother batter.
🌾 6. Add the Dry Ingredients
Add the flour, baking powder, and salt.
Use a spatula to gently fold everything together.
Stop mixing as soon as you no longer see streaks of dry flour.
Don’t overmix. A few strokes too many can make the bars cakier and less fudgy.
🌰 7. Fold in the Walnuts
Fold in the chopped walnuts.
Reserve a small handful for sprinkling over the top if desired.
For even more flavor, toast the walnuts beforehand at 350°F (175°C) for 5–7 minutes, then cool them completely.
🍫 8. Transfer to the Pan
Pour the batter into the prepared baking pan.
Spread it evenly into the corners using a spatula.
Sprinkle the reserved walnuts over the top.
For an extra chocolatey version, scatter chocolate chips over the surface.
🔥 9. Bake
Bake for approximately 25–30 minutes.
The edges should look set and slightly crisp while the center should remain soft.
A toothpick inserted into the center should come out with moist chocolate crumbs, rather than completely clean.
For especially fudgy bars, avoid overbaking.
❄️ 10. Cool Completely
Place the pan on a wire rack.
Allow the brownies to cool in the pan for at least 30 minutes.
For the cleanest slices and fudgiest texture, refrigerate them for another 30–60 minutes after cooling.
🔪 11. Slice
Use the parchment overhang to lift the brownie slab from the pan.
Place it on a cutting board.
Use a sharp knife to cut into 12 large bars or 16 smaller squares.
For clean cuts, wipe the knife between slices.
⭐ Chef’s Tips
Use Very Ripe Bananas
Bananas with plenty of brown spots provide the best sweetness and banana flavor.
Don’t Overmix
Mix the batter only until the flour disappears. This keeps the bars tender and fudgy.
Don’t Overbake
The center should still look slightly soft when you remove the pan from the oven.
Toast the Walnuts
Toasting brings out their buttery flavor and gives the bars a wonderful crunch.
Chill for Extra Fudginess
A short chill makes the chocolate flavor more pronounced and gives the brownies an especially dense texture.
🍫 Delicious Variations
Chocolate Chip Banana Brownies
Add ½ cup semisweet or dark chocolate chips to the batter.
Peanut Butter Banana Brownies
Swirl ¼ cup creamy peanut butter over the batter before baking.
Double Chocolate Walnut
Add ½ cup chocolate chips and an extra handful of walnuts on top.
Salted Chocolate Banana
Sprinkle flaky sea salt over the brownies immediately after baking.
Banana Nutella
Swirl ¼ cup Nutella into the batter before baking.
🍨 Serving Suggestions
Serve these bars:
- Warm with vanilla ice cream
- With a drizzle of chocolate sauce
- With caramel sauce
- Alongside whipped cream
- With fresh banana slices
- With a cup of coffee or cold milk
For the ultimate dessert, warm one bar for 10–15 seconds and top with a scoop of vanilla ice cream.
🧊 Storage
Store completely cooled brownie bars in an airtight container.
Room temperature: 2–3 days
Refrigerator: Up to 5 days
If refrigerated, allow them to sit at room temperature for a few minutes before serving for the softest texture.
❄️ Freezing
Wrap individual bars tightly in plastic wrap and place them in a freezer-safe container or bag.
Freeze: Up to 2 months.
Thaw overnight in the refrigerator or for about an hour at room temperature.
🍌🍫🌰 Recipe Summary
These Banana Walnut Brownie Bars bring together ripe banana, rich cocoa, melted butter, and crunchy walnuts in one deeply chocolatey treat.
They’re gooey in the center, lightly crisp around the edges, and packed with buttery walnut crunch—a delicious way to turn a few ripe bananas into something much more indulgent than ordinary banana bread.
Rich chocolate + sweet banana + toasted walnuts = pure brownie bliss. 🍌🍫🌰