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Chocolate Marbled Banana Bread

You’ll be surprised how easy Chocolate Marbled Banana Bread is to make! This banana bread recipe has it all: a moist, fluffy crumb, dots of chocolate chips, and a gorgeous chocolate banana swirl. 

Make sure to try my Chocolate Chip Banana Bread too! I use a special trick to make it the best!

Chocolatey Marble Banana Bread

In case you’re new around here, I’m a huge fan of banana bread. This site alone is home to about a dozen or more banana bread recipes, and I swear each one is better than the last! Can’t stop, won’t stop.

Just when I thought I reached the pinnacle of banana bread glory with my Best Ever Chocolate Chip Banana Bread, however, this Chocolate Marbled Banana Bread comes busting out of the oven!

This marbled chocolate banana bread has it all: sweet fruity flavor, a wonderfully fluffy yet moist crumb, and swirls of chocolate-banana goodness. Sigh. And to top it all off (literally AND figuratively), there’s decadent chocolate chips scattered throughout!

What You’ll Need

  • Flour: All-purpose flour is my go-to.
  • Cocoa Powder: Unsweetened cocoa powder. You can use Dutch process if you prefer, for a fudgier flavor.
  • Leavening: This banana bread recipe uses baking powder as well as baking soda to achieve a nice rise.
  • Butter: melted and cooled slightly
  • Sugar: You’ll need light brown sugar for the chocolate banana bread batter, as well as granulated sugar for the regular batter.
  • Bananas: This is the time for your senior bananas to shine! You’ll need bananas that are ripe or slightly overripe for mashing, to give your banana bread the perfect sweetness and texture.
  • Vanilla: Ideally pure vanilla extract, and not the imitation kind.
  • Eggs: I use large and like them to be room temperature!
  • Sour Cream: You can use another dairy alternative, like Greek yogurt or buttermilk. These will also work to bring the banana bread the acidity it needs, plus a hint of tang and added moisture! 
  • Semi-Sweet Chocolate Chips: This isn’t just any old marbled chocolate banana bread – it’s also brimming with loads of semi-sweet chocolate!

How to Make Chocolate Marbled Banana Bread

Preheat the oven to 350°F. Coat a 9×5- inch loaf pan with nonstick spray. Cut parchment paper into a strip so that it fits in the bottom of the pan and up sides. Coat again with nonstick spray and set aside.

Prepare the Dry Ingredients: In separate bowls, whisk together the dry ingredients for both the chocolate banana bread batter as well as the regular banana bread batter.

Prepare the Wet Ingredients: Mix the mashed bananas with the melted butter, sour cream, eggs, and vanilla in another bowl. 

Combine: Add half the mixture into the chocolate dry ingredients, and the other half into the bowl for the regular batter. Give it a mix until just combined. Next, you’ll stir in the chocolate chips.

Fill the Pan: Drop alternating spoonfuls of chocolate and regular banana bread batter into a lined 9×5 inch loaf pan, then give it a gentle swirl with a knife. Top the batter with the last of your chocolate chips.

Bake: Bake the banana bread loaf until it passes the toothpick test, where a toothpick stuck into the middle comes out clean. Once the loaf is out of the oven, leave it to cool for a bit and then transfer it to a wire rack.

This marbled banana bread can be served warm or at room temperature, just as it is or smothered with butter!

Tricks for the Perfect Marble

The perfect chocolate marbled banana bread is truly an exercise in restraint. It may be tempting to give the batters a few extra swirls for good measure, but resist the urge!

  • One or two swirls from top to bottom should be enough to get a nice marbled effect. 
  • Use a knife or a fork, just don’t over-swirl!
  • Over swirling will cause the batter to merge into a solid color, and an overall more chocolate flavor. Still delicious, just not what we’re going for!

More Tips + Variation Ideas

  • What’s the Best Way to Mash Bananas?: Depending on who you ask, some prefer to use a potato masher, while others get messy with their hands! I personally just toss the peeled bananas into a bowl and use a fork. As far as consistency is concerned, you can leave some chunks of banana, or don’t. That’s up to you!
  • Don’t Over-mix the Batter: Avoid over-mixing both the regular and chocolate banana bread batters. Use a wooden spoon or spatula (and not a whisk), and mix the wet and dry ingredients for both until they’re just combined. No need to worry about the odd lump!
  • Use Another Pan: This recipe uses a 9×5 loaf pan. If you’d prefer a taller loaf, use an 8×4 inch loaf pan instead. Either size will do, just check the bread as it nears the end of its baking time to ensure it bakes through!
  • Add Nuts: Bring a little crunch to your banana bread by adding in a handful of crushed walnuts, toasted hazelnuts, or pecans (plus extra to sprinkle over top!).
  • Add Fruit: Add in fresh or dried fruit like blueberries, raspberries, raisins or craisins, or diced canned pineapple that’s been drained and patted dry.
  • Swap the Chocolate Chips: Trade out the chocolate chips for white chocolate chunks, mini peanut butter cups, or your favorite chopped up candy bars!
  • Add Chocolate Sauce: After it’s cooled, give your marbled banana bread a drizzle of homemade Nutella Hot Fudge Sauce for an extra layer of chocolate-y flavor. You can also try Caramel Sauce!
A loaf of chocolate marbled banana bread sliced to reveal the marbled interior.

How to Store

Once it’s cooled completely, keep your marbled banana bread wrapped or stored airtight at room temperature for up to 3 days. 

Can I Freeze Banana Bread?

This banana bread will keep fresh when frozen for up to 30 days. Store it tightly wrapped or in an airtight bag or container. Let it defrost unwrapped at room temperature.

More Banana Recipes to Try

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A loaf of chocolate marbled banana bread sliced to reveal the marbled interior.

Chocolate Marbled Banana Bread

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 5 from 2 reviews
  • Author: Shelly
  • Prep Time: 10 minutes
  • Cook Time: 1 hour
  • Total Time: 1 hour 10 minutes
  • Yield: 8 servings 1x
  • Category: Breads
  • Method: Oven
  • Cuisine: American


Chocolate Marbled Banana Bread is so easy to make! This banana bread recipe is moist and fluffy, filled with chocolate chips and a gorgeous chocolate banana swirl.


  • 1 3/4 cup all purpose flour, divided
  • 1/2 cup light brown sugar
  • 1/4 cup unsweetened cocoa powder
  • 1 teaspoon baking powder, divided
  • 1/2 teaspoon baking soda, divided
  • 1/2 teaspoon kosher salt, divided
  • 1/2 cup granulated sugar
  • 1/2 cup butter, melted and cooled slightly
  • 1/3 cup sour cream
  • 3 medium ripe bananas, mashed (about 1 1/2 cups)
  • 2 large eggs, room temperature
  • 1 1/2 teaspoons vanilla extract
  • 1 1/4 cups semi-sweet chocolate chips


  1. Preheat the oven to 350°F. Coat a 9×5- inch loaf pan with nonstick spray. Cut parchment paper into a strip so that it fits in the bottom of the pan and up sides. Coat again with nonstick spray and set aside.
  2. Make the Chocolate Banana Bread: In a bowl whisk together 3/4 cup all purpose flour, brown sugar, cocoa powder, 1/2 teaspoon baking powder, 1/4 teaspoon baking soda, and 1/4 teaspoon kosher salt. Set aside.
  3. Make the Regular Banana Bread: In a bowl whisk together the remaining 1 cup all purpose flour, 1/2 teaspoon baking powder, 1/4 teaspoon baking soda, 1/4 teaspoon kosher salt, and 1/2 cup granulated sugar. Set this aside as well.
  4. In another bowl mix together the melted butter, sour cream, mashed bananas, eggs, and vanilla extract. Divide this mixture in half between the chocolate and regular banana bread dry ingredients. (It will be approximately 1 2/3 cups of the mixture in each) and stir to incorporate. 
  5. Stir in 1/2 cup of chocolate chips into each mixture.
  6. Drop spoonfuls of each batter into the prepared pan, alternating as you add. Once all the batter is added, use a butter knife to gently swirl the batters together. Don’t over-swirl.
  7. Add the remaining 1/4 cup of chocolate chips on top and bake for 50 – 60 minutes, or until a toothpick inserted into the center of the loaf comes out clean.
  8. Allow the bread to cool in the pan for 20 minutes before using the parchment paper to lift the bread from the pan and transfer to a cooling rack.


Serve warm or at room temperature

Store airtight at room temperature for up to 3 days. 

Freeze airtight for up to 30 days for best freshness.

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16 comments on “Chocolate Marbled Banana Bread”

  1. I love this recipe! Would I be able to make them into cupcakes, and how much would I change the time if so?

  2. Janean Bartholomew

    This looks so good and filling. I have a question. When you work so hard to actually post a recipe as good as this does people always need to tweak or change the recipe?

    1. There is no need to tweak the recipe, as I have tested it as printed many times, but with that said, that doesn’t stop people from altering them!

  3. King Arthur makes the best stirrer for muffins brownies stuff you don’t want to over mix yes it’s a gadget but it works

  4. The marble banana bread looks delicious, but I was surprised to see that there are no eggs in the recipe. Does the bread hold together? I would expect it to crumble.

    1. I agree Lori!! When I printed it… it did not print the eggs for some odd reason. I thought I was losing my mind! But then I went back to look online at the recipe and they were listed. Although under instructions number four it doesn’t say anything about eggs but of course being wet you would mix it with the wet ingredients!

    1. It’s 3/4 of a cup of flour for the chocolate banana portion and 1 cup for the regular banana portion!

  5. In your recipe, you state you need 1 cup of flour, but your directions say use 1 cup then use 3/4 cup. I’m very confused about the directions. Why not just mix all the dry ingredients, (minus the cocoa,) mix with the butter/banana mixture, then divide and mix in the cocoa to one half? It would seem like a lot less measuring and work. A lot less bowls to clean, too. Just a suggestion. I make recipes up in my head and have to tweak them many times before they’re ready to share. I also have a cookbook in process. I love your page. Very inspiring! Keep up the good work!❤ Petite Chef Ann

    1. Chocolate banana bread portion use brown sugar the regular banana bread portion uses white sugar that’s why they’re mixed separately.

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