Why did the banana topping lose its crisp sugar?

Torching it too early gives the sugar time to absorb moisture from the fruit. Put the thin banana round on each square and torch it right before serving, when the sugar can stay crisp.

Can I make these ahead?

You can chill the whole baked slab in the refrigerator for 30 minutes before slicing.

How should I store banana bread brownies?

Let the squares cool to room temperature first, or the container traps humidity. Store ungarnished squares in an airtight container lined with a paper towel. They'll keep at room temperature for up to three days. For longer storage, I'd refrigerate the squares for up to one week and add a freshly caramelized banana round only when you're ready to serve.

Can I freeze the squares?

Yes, wrap each ungarnished square tightly in plastic wrap, then aluminum foil. Freeze them for up to three months and thaw overnight in the refrigerator.

Banana Bread Brownies: Marbled Chocolate Dessert

By Lucas MorganOct 12, 2026

Cook

45 min

Total

45 min

Servings

Level

Medium

Jump to recipe

Whisking melted butter, sugar, and eggs until pale builds a crackly, glossy top on these banana bread brownies, while the thick cocoa base stays fudgy underneath. I make them when spotted bananas need using up and a plain loaf won't do (the swirl is half the fun).

Use an 8×8-inch light-colored metal pan, lined with parchment that hangs over two sides, because glass holds heat longer and can take the golden banana layer too far. I spread the chocolate batter into the corners with an offset spatula. It gives the banana batter a level base before I swirl the two together.

A toothpick from the center should carry moist, fudgy crumbs when it comes out. Don't wait for a clean toothpick. It dries the brownie layer, while pulling it at the crumb stage leaves the dense base set enough to cut once it cools. The chocolate chips stay visible on top as small dark pools against the marbled surface.

For serving, I put a square on a white ceramic plate because I like seeing the marbling against it, then add the caramelized banana round at the last minute. A cold glass of whole milk works well here, or serve one with a robust shot of hot espresso.

Why you'll love this recipe

Whisk the butter and sugar for two minutes, then add the eggs gradually for a glossy, crackly top.
An 8×8-inch light metal pan bakes the thick base without pushing the edges too far.
One continuous figure-eight swirl leaves dark and banana-colored streaks visible, with a different pattern in each square.
Pull it when the toothpick has moist crumbs and the brownie layer still feels fudgy.
Press chocolate chips into the surface before baking, and they'll stay dotted across the top.
Parchment hanging over two sides lets you lift the cooled slab out cleanly before cutting squares.

Instructions

Preheat the oven to 350°F (175°C).

Line an 8×8-inch light-colored metal baking pan with parchment paper, leaving an overhang on two sides.

Whisk the melted butter and granulated sugar for about two full minutes in a large glass mixing bowl.

Whisk in the eggs one at a time until the mixture is pale and thicker.

Fold in the melted dark chocolate and vanilla extract until smooth.

Sift the cocoa powder, all-purpose flour, and kosher salt over the wet mixture.

Fold the dry ingredients in with a rubber spatula until just combined.

Spread the brownie batter evenly in the prepared pan with an offset spatula.

Mash the overripe bananas in a separate medium bowl until nearly liquid with no large lumps.

Whisk the melted butter, granulated sugar, egg, and vanilla extract into the mashed bananas.

Sprinkle the all-purpose flour, baking soda, and kosher salt over the banana mixture.

Fold the banana batter until no dry flour streaks remain.

Spoon dollops of banana bread batter over the chocolate batter.

Drag a butter knife through both batters in one continuous figure-eight motion, scraping to the bottom of the pan.

Scatter the semi-sweet chocolate chips over the surface and press them gently into the batter.

Bake for 40 to 45 minutes, until a toothpick inserted in the center comes out with moist, fudgy crumbs attached.

Cool the bake entirely in the pan.

Cut the cooled slab into neat squares.

Place one thin banana round on each square.

Sprinkle the banana rounds with sugar.

Briefly torch the sugared banana rounds until caramelized.

FAQ

Cold eggs can shock the melted butter and make the batter seize. Let the eggs come to room temperature before you start, then whisk them in one at a time until the mixture looks pale and thicker.

Banana Bread Brownies: Marbled Chocolate Dessert

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Desserts Vegetarian Baking

Banana Bread Brownies: Marbled Chocolate Dessert

Name: Banana Bread Brownies: Marbled Chocolate Dessert
Cook time: 45 min
Total time: 45 min
Yield: 16 squares
Ingredients: 1/2 cup unsalted butter (113 g, melted, for brownie batter); 1 cup granulated sugar (200 g, for brownie batter); 2 large eggs (100 g, room temperature, for brownie batter); 1/2 cup unsweetened cocoa powder (45 g); 1/2 cup all-purpose flour (60 g, for brownie batter); 2 oz dark chocolate (56 g, melted); 1/4 tsp kosher salt (1.5 g, for brownie batter); vanilla extract (amount not specified, used in both batters); 3/4 cup overripe bananas (150 g, mashed); 1/4 cup unsalted butter (56 g, melted, for banana bread batter); 1/2 cup granulated sugar (100 g, for banana bread batter); 1 large egg (50 g, for banana bread batter); 3/4 cup all-purpose flour (90 g, for banana bread batter); 1/2 tsp baking soda (2.5 g); kosher salt (for banana bread batter, amount not specified); 1/2 cup semi-sweet chocolate chips (85 g); 1 firm banana (118 g, sliced into 16 thin rounds); 1 tbsp granulated sugar (12 g, for banana garnish)

By Lucas MorganOct 12, 2026

Cook

45 min

Total

45 min

Servings

Level

Medium

Jump to recipe

Why you'll love this recipe

Whisk the butter and sugar for two minutes, then add the eggs gradually for a glossy, crackly top.
An 8×8-inch light metal pan bakes the thick base without pushing the edges too far.
One continuous figure-eight swirl leaves dark and banana-colored streaks visible, with a different pattern in each square.
Pull it when the toothpick has moist crumbs and the brownie layer still feels fudgy.
Press chocolate chips into the surface before baking, and they'll stay dotted across the top.
Parchment hanging over two sides lets you lift the cooled slab out cleanly before cutting squares.

Ingredients

Servings16

•½ cup unsalted butter (113 g, melted, for brownie batter)
•1 cup granulated sugar (200 g, for brownie batter)
•2 large eggs (100 g, room temperature, for brownie batter)
•½ cup unsweetened cocoa powder (45 g)
•½ cup all-purpose flour (60 g, for brownie batter)
•2 oz dark chocolate (56 g, melted)
•¼ tsp kosher salt (1.5 g, for brownie batter)
•vanilla extract (amount not specified, used in both batters)
•¾ cup overripe bananas (150 g, mashed)
•¼ cup unsalted butter (56 g, melted, for banana bread batter)
•½ cup granulated sugar (100 g, for banana bread batter)
•1 large egg (50 g, for banana bread batter)
•¾ cup all-purpose flour (90 g, for banana bread batter)
•½ tsp baking soda (2.5 g)
•kosher salt (for banana bread batter, amount not specified)
•½ cup semi-sweet chocolate chips (85 g)
•1 firm banana (118 g, sliced into 16 thin rounds)
•1 tbsp granulated sugar (12 g, for banana garnish)

Instructions

1
Preheat the oven to 350°F (175°C).
2
Line an 8×8-inch light-colored metal baking pan with parchment paper, leaving an overhang on two sides.
3
Whisk the melted butter and granulated sugar for about two full minutes in a large glass mixing bowl.
4
Whisk in the eggs one at a time until the mixture is pale and thicker.
5
Fold in the melted dark chocolate and vanilla extract until smooth.
6
Sift the cocoa powder, all-purpose flour, and kosher salt over the wet mixture.
7
Fold the dry ingredients in with a rubber spatula until just combined.
8
Spread the brownie batter evenly in the prepared pan with an offset spatula.
9
Mash the overripe bananas in a separate medium bowl until nearly liquid with no large lumps.
10
Whisk the melted butter, granulated sugar, egg, and vanilla extract into the mashed bananas.
11
Sprinkle the all-purpose flour, baking soda, and kosher salt over the banana mixture.
12
Fold the banana batter until no dry flour streaks remain.
13
Spoon dollops of banana bread batter over the chocolate batter.
14
Drag a butter knife through both batters in one continuous figure-eight motion, scraping to the bottom of the pan.
15
Scatter the semi-sweet chocolate chips over the surface and press them gently into the batter.
16
Bake for 40 to 45 minutes, until a toothpick inserted in the center comes out with moist, fudgy crumbs attached.
17
Cool the bake entirely in the pan.
18
Cut the cooled slab into neat squares.
19
Place one thin banana round on each square.
20
Sprinkle the banana rounds with sugar.
21
Briefly torch the sugared banana rounds until caramelized.

FAQ

Cold eggs can shock the melted butter and make the batter seize. Let the eggs come to room temperature before you start, then whisk them in one at a time until the mixture looks pale and thicker.