One-Bowl Fudgy Banana Brownies
These banana brownies are rich, chocolatey, and surprisingly fudgy, using ripe bananas to cut back on added sugar and butter without tasting like health food. If you need a brownie fix that doesn’t require a mixer or a pile of dishes, this one-bowl recipe is it.
The bananas keep the crumb tender, and a generous amount of cocoa powder makes sure the chocolate flavor stays front and center. Just mash, stir, and bake.
What Makes These Brownies So Good
These brownies hit that sweet spot between a classic brownie and a dark, moist banana bread. They’re dense and fudgy, with a crackly top that shatters when you slice in.
The banana adds moisture and a subtle sweetness, so you can use less sugar and still get a deeply satisfying chocolate dessert. I keep coming back to this version because it’s the quickest way to turn a couple of overripe bananas into something that feels like a real treat.
Ingredients
- 3/4 cup (150 g) granulated sugar: cuts back from a standard brownie, the banana handles the rest.
- 1/2 cup (113 g) unsalted butter: melted, or use melted refined coconut oil for dairy-free.
- 2 large ripe bananas (about 1 cup mashed): the spottier the peel, the sweeter and more tender the brownies.
- 1 large egg: at room temperature.
- 1 tsp vanilla extract: rounds out the chocolate.
- 3/4 cup (90 g) all-purpose flour: spooned and leveled, not scooped, to keep the texture fudgy.
- 1/2 cup (50 g) unsweetened cocoa powder: Dutch-process gives a deeper color and smooth flavor.
- 1/2 tsp baking soda: just enough to give a slight lift without turning cakey.
- 1/4 tsp fine sea salt: brightens the chocolate and banana.
- 1/2 cup (85 g) semisweet chocolate chips: plus a few extra to press on top before baking.
Variations / Substitutions
- Richer chocolate flavor: swap up to half the granulated sugar for packed brown sugar. It adds a molasses note and keeps the center extra fudgy.
- Add nuts: fold in 1/2 cup toasted chopped walnuts or pecans with the chocolate chips for a little crunch.
- Gluten-free: use a 1-to-1 gluten-free flour blend that contains xanthan gum, the texture stays tender.
- Dairy-free: use melted coconut oil instead of butter, and double-check your chocolate chips are dairy-free.
- Espresso boost: stir 1 tsp instant espresso powder into the melted butter before adding the bananas, it deepens the chocolate without tasting like coffee.
If you enjoy this, you’ll probably also like the simple Chocolate Banana Muffins on the site.
How to Make One-Bowl Fudgy Banana Brownies
Step 1: Mash the Bananas and Melt the Butter
Preheat your oven to 350°F (175°C) and line an 8-inch square baking pan with parchment paper, leaving a little overhang on two sides so you can lift the brownies out later. Peel the 2 ripe bananas and mash them in a large mixing bowl until mostly smooth. A few small lumps are fine.
Melt the 1/2 cup butter in a small saucepan over low heat or in a microwave-safe bowl in 20-second bursts. Pour the warm butter into the bowl with the bananas and stir until combined. The mixture will smell sweet and buttery right away.
Step 2: Whisk in the Sugar and Egg
Add the 3/4 cup granulated sugar, the egg, and the 1 tsp vanilla extract to the same bowl. Whisk vigorously for about 1 minute, until the sugar starts to dissolve and the mixture looks glossy and uniform.
You want the sugar to partially dissolve, which helps create that shiny crackly top later. The batter will loosen slightly and look a shade darker. If your egg is cold, whisking a few extra seconds helps smooth everything out.
Step 3: Fold in the Dry Ingredients and Chocolate Chips
Sprinkle the 3/4 cup flour, 1/2 cup cocoa powder, 1/2 tsp baking soda, and 1/4 tsp salt over the wet mixture. Use a rubber spatula to gently fold everything together until no streaks of flour or cocoa remain. Be careful not to overmix, a few gentle folds is all it takes.
Now stir in the 1/2 cup chocolate chips, reserving a handful to press onto the top. The batter will be thick and glossy, almost like a dense mousse. At this point it should smell deeply of chocolate with just a hint of banana.
Step 4: Bake the Brownies Until Just Set
Scrape the batter into your prepared pan and spread it evenly to the corners. Smooth the top, then scatter the reserved chocolate chips over the surface and press them in lightly. Bake on the center rack for 22 to 25 minutes.
A toothpick inserted into the center should come out with a few moist crumbs clinging to it, not wet batter. If it comes out clean, they’re overbaked and you’ll lose that fudgy middle. The edges will pull away slightly from the sides of the pan and the top will look set and shiny.
Step 5: Cool and Slice
Let the brownies cool completely in the pan on a wire rack, which takes about 30 minutes. Run a knife along the edges that aren’t lined with parchment, then use the overhang to lift the whole block out. Set it on a cutting board and slice into 9 large or 12 smaller squares with a sharp knife, wiping the blade between cuts for clean edges.
The top will be glossy and crackled, and the centers will stay wonderfully fudgy for two or three days. If you can wait that long.
Tips for Fudgy Banana Brownies
- Use truly overripe bananas: you want peels that are heavily spotted or fully brown. They mash more easily and bring more natural sweetness, so you need less sugar.
- Don’t overbake, even by a minute: the carryover heat in the pan continues cooking them after they leave the oven. Pull them when a toothpick shows a few moist crumbs, not when it’s bone-dry.
- Rest them before slicing: cutting warm brownies works, but letting them cool fully firms up the structure and gives cleaner squares. If you can’t resist, expect slightly messier pieces.
- Press extra chips on top: this simple move gives you those glossy puddles of melted chocolate across the surface and makes the brownies look irresistible.
Bake times by pan size:
| Pan size | Bake time |
|---|---|
| 8×8-inch metal pan | 22 – 25 mins |
| 9×9-inch metal pan | 18 – 20 mins |
| 8×8-inch glass or ceramic pan | 25 – 28 mins |
Storing Leftover Brownies
Refrigerate: keep cut brownies in an airtight container at room temperature for up to 4 days. A slice of bread in the container helps them stay soft. In warm weather, refrigerate them for up to a week, but bring them back to room temperature before eating for the best texture.
Reheating: a 10-second zap in the microwave revives the fudgy center. For a crisp edge, warm them in a toaster oven for a couple of minutes.
Frequently Asked Questions
Can I use frozen bananas?
Yes, but thaw them completely first and drain off any excess liquid. Frozen bananas often release more water, which can make the brownies a little softer, but they still bake up fudgy and delicious.
Why didn’t my brownies get a crackly top?
The crackle comes from dissolving the sugar into the warm butter and egg mixture early on. Whisk that step well, and use granulated sugar rather than all brown sugar. A cold egg can slow dissolution, so use a room-temperature one.
Can I skip the chocolate chips?
You can, but the brownies will taste more like a plain chocolate bar than a loaded one. Chopped nuts or even a handful of dried cherries work nicely as a substitute for the same mix-in texture.
Are these brownies healthy?
They’re less sweet than most and use banana for moisture, but they’re still a dessert. Think of them as a brownie with a fruit boost, not a diet switch.
Banana Brownie Recipe
Ingredients
Method
- Preheat the oven to 350°F (175°C) and line an 8-inch square pan with parchment.
- Mash the bananas in a large bowl. Melt the butter and stir it into the bananas.
- Whisk in the sugar, egg, and vanilla until glossy.
- Fold in the flour, cocoa, baking soda, and salt until just combined. Stir in most of the chocolate chips, reserving a few for the top.
- Spread the batter in the pan, scatter the remaining chips on top, and bake 22–25 minutes until a toothpick comes out with moist crumbs.
- Cool completely in the pan, then lift out and slice.
