One-Bowl Chocolate Banana Bread

This chocolate banana bread is a one-bowl wonder that turns overripe bananas into a deep, fudgy loaf packed with cocoa and melty chocolate chunks.

Mix it by hand, no mixer needed, and the hardest part is waiting for it to cool before slicing.

Why This Chocolate Banana Bread Works

The crumb hits that sweet spot between cake and brownie. It is dense enough to feel substantial, but still tender and moist from the bananas.

A generous dose of Dutch-process cocoa gives it a dark, intense chocolate flavor without any bitterness. Melted butter and sour cream keep it rich, and you stir everything together with a wooden spoon, no fancy equipment required.

Ingredients

• 1 3/4 cups all-purpose flour, spooned and leveled: measure carefully for a tender crumb
• 3/4 cup Dutch-process cocoa powder: gives the deepest chocolate color and flavor
• 1 tsp baking soda: reacts with the sour cream for lift
• 1/2 tsp fine sea salt: balances the sweetness
• 1/2 cup unsalted butter, melted and slightly cooled: adds richness
• 3/4 cup granulated sugar
• 1/2 cup packed light brown sugar: brings a hint of caramel
• 2 large eggs, at room temperature
• 1 tsp vanilla extract
• 1 1/2 cups mashed very ripe bananas: about 3 medium, nearly black peels are best
• 1/2 cup full-fat sour cream: creates a soft, moist loaf
• 1 cup semisweet chocolate chips: plus a few extra for the top if you like

Variations / Substitutions

• Swap sour cream for plain yogurt: the texture stays nearly identical; use full-fat Greek or regular
• Use natural cocoa instead of Dutch-process: the bread will be a bit lighter in color and flavor, and a touch less tender
• Replace the chocolate chips with toasted walnuts or pecans: roughly chop about 3/4 cup and fold them in for crunch
• Add a teaspoon of instant espresso powder: it will not taste like coffee, just a deeper chocolate punch

Banana Bread Overnight Oats are a delicious breakfast to pair with this banana bread.

How to Make Chocolate Banana Bread

Step 1: Mix the Wet Ingredients

In a large microwave-safe bowl, melt the 1/2 cup butter. Whisk in the 3/4 cup granulated sugar and 1/2 cup brown sugar until the mixture looks smooth, about 30 seconds. Crack in the 2 eggs, one at a time, whisking well after each, then stir in the 1 tsp vanilla, the 1 1/2 cups mashed bananas, and the 1/2 cup sour cream.

The mixture will feel glossy and might look slightly separated from the sour cream. That is fine, it comes together once the dry ingredients go in.

Step 2: Sift in the Dry Ingredients

Hold a fine-mesh strainer right over the bowl and sift in the 1 3/4 cups flour, 3/4 cup cocoa, 1 tsp baking soda, and 1/2 tsp salt. Sifting knocks out any lumps and keeps the loaf light.

You will see a dark cocoa layer floating on top of the wet ingredients, ready to be folded in.

Step 3: Fold the Batter Together

Use a rubber spatula to gently fold the dry ingredients into the wet, scraping from the bottom of the bowl with each stroke. When a few thin streaks of flour remain, add the 1 cup chocolate chips and fold just until everything disappears into the batter, about 5 or 6 more strokes.

Stop as soon as no white flour patches are visible. Overmixing makes banana bread tough, so err on the side of a couple small lumps.

Step 4: Bake the Bread

Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line it with a parchment sling for easy removal. Scrape the thick batter into the pan, smooth the top, and scatter a few extra chocolate chips over the surface if you want a prettier top. Bake on the center rack for 55 to 65 minutes, until a toothpick inserted in the center comes out with a few moist crumbs, not wet batter.

The kitchen should smell deeply of chocolate and banana by the 40-minute mark. If the top darkens too fast, tent the pan loosely with foil for the last 15 minutes.

Step 5: Turn Out and Slice

Let the loaf cool in the pan on a wire rack for 10 minutes, then lift it out using the parchment and set it on the rack to cool completely. Once fully cool, slice thickly with a serrated knife.

Warm slices are tempting straight from the pan, but the crumb holds together much better when the bread has cooled completely.

A Few Notes Before You Start

• The riper the bananas, the better. Black-peeled, soft bananas mush into the batter easily and pack the most sweetness and moisture.
• If the loaf sticks, run a thin knife around the edges before lifting it out. A parchment sling prevents most sticking issues.
• A serrated bread knife slices this cleanly without squashing the tender crumb. Letting the loaf cool overnight makes slicing even neater.
• Store the bread at room temperature tightly wrapped for up to 2 days, or refrigerate for up to 5 days. Warm individual slices in a toaster for a few seconds to reinvigorate the chocolate chips.

Bake times shift slightly depending on your loaf pan.

Storing Leftovers

• Refrigerate: wrap the cooled loaf tightly in plastic wrap and store in the fridge for up to 5 days. The flavor deepens a touch after a day.
• Reheating: a quick toast or a 20-second microwave zap brings the chocolate back to a melty state.

Frequently Asked Questions

Can I use frozen bananas?

Yes, thaw them completely and drain off any watery liquid before mashing. Thawed bananas are extra soft and work beautifully here.

What if I do not have sour cream?

Plain full-fat yogurt or buttermilk both work. Use the same 1/2 cup amount, and the texture stays nearly as moist.

Can I bake these as muffins instead?

Absolutely. Divide the batter into a greased 12-cup muffin tin and bake at 350°F (175°C) for 18 to 22 minutes, until a toothpick comes out clean.

Can I swap the butter for oil?

You can use 1/2 cup of a neutral oil like vegetable or canola. The loaf will be a little bit softer and lack that buttery richness, but it will still taste great.

Chocolate Banana Bread Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 15 minutes mins

Servings: 10 servings

Calories: 380

Ingredients Method Notes

Ingredients

  

• 1 3/4 cups all-purpose flour
• 3/4 cup Dutch-process cocoa powder
• 1 tsp baking soda
• 1/2 tsp fine sea salt
• 1/2 cup unsalted butter, melted and slightly cooled
• 3/4 cup granulated sugar
• 1/2 cup packed light brown sugar
• 2 large eggs, at room temperature
• 1 tsp vanilla extract
• 1 1/2 cups mashed very ripe bananas
• 1/2 cup full-fat sour cream
• 1 cup semisweet chocolate chips

Method

 

1. In a large bowl, whisk the melted butter, both sugars, eggs, vanilla, bananas, and sour cream until smooth.
2. Sift the flour, cocoa, baking soda, and salt directly into the bowl using a fine-mesh strainer.
3. Gently fold the dry ingredients into the wet, add the chocolate chips, and fold just until no dry flour streaks remain.
4. Pour the batter into a greased and parchment-lined 9×5-inch loaf pan, top with extra chips if desired, and bake at 350°F for 55 to 65 minutes, until a toothpick comes out with moist crumbs.
5. Cool in the pan for 10 minutes, then turn out onto a rack to cool completely before slicing.

Notes

If the top browns too quickly during baking, tent the pan loosely with foil for the last 15 minutes. The loaf slices cleanest after a full cool, and the chocolate chips will be set but still tender.