Marbled Chocolate Banana Bread

This easy Marbled Chocolate Banana Bread is a super moist banana bread made with sour cream and browned butter, and then swirled with chocolate! Perfect for breakfast or dessert!

Banana bread is my all-time favorite quick bread! Try my Caramel Pecan Banana Bread or Double Chocolate Banana Bread for more delicious treats!

Marbled Chocolate Banana Bread on a white chopping board with a chocolate covered knife.

This has to be one of the BEST Banana bread recipes I have ever made! This Marbled Chocolate Banana Bread is incredibly moist, perfectly sweet, and swirled with chocolate. It has a wonderful nutty toffee flavor from the browned butter and is super moist thanks to the sour cream! I also added four bananas to keep the batter extra soft.

I love making this easy banana bread recipe ahead of time. It keeps well on the counter for a few days, and up to a week in the fridge. You can also freeze half for later if you don’t want to eat it all in one week.

This Marbled Chocolate Banana Bread pairs perfectly with coffee and company!

What you’ll need to make this recipe

  • Butter: Butter is browned and adds so much flavor to the bread. It tastes almost nutty and toffee-like!
  • Sugar: I prefer light brown sugar as it adds extra moisture to the bread, however, dark brown sugar or granulated sugar would also work.
  • Vanilla: Vanilla extract bring warms and emphasizes sweetness.
  • Eggs: This is our binding ingredient, keeping everything in this Marbled Chocolate Banana Bread together.
  • Bananas: Mashed bananas add flavor and retain moisture. Make sure you use very ripe bananas which have plenty of brown spots on them. The softer, the better!
  • Sour cream: Again, more moisture! Sour cream also gives the banana bread a slight tang. It’s so delicious with the chocolate!
  • Flour: All-purpose flour is the foundation of this bread recipe.
  • Baking soda: This gives the bread a little lift and makes it less dense.
  • Salt: To bring out all of the flavors I like to add a little salt to my desserts.
  • Cocoa powder: The chocolate swirl batter is banana bread with cocoa powder. Opt for unsweetened cocoa powder.

How to make marbled chocolate banana bread

  1. Brown the butter: Start by making your browned butter. Add butter to a small saucepan and cook over medium heat until light brown/caramel in color. 5-10 minutes.
  2. Mix with sugar and vanilla: Pour the browned butter into a large bowl along with the sugar and vanilla, and mix until combined.
  3. Add the other wet ingredients: Fold in the eggs one at a time then add in the bananas and sour cream.
  4. Mix the dry ingredients: In a large bowl combine flour, baking soda, and salt. Add the dry ingredients to the wet ingredients.
  5. Make the chocolate swirl batter: Scoop 1 cup of the batter into the bowl you used for dry ingredients. Add in cocoa powder and mix to combine.
  6. Pour and swirl: Pour both batters into the prepared pan alternating between chocolate and regular. Use a butter knife to swirl.
  7. Bake for 1 hour or until a toothpick comes out clean.
  8. Cool: Remove from the oven and let cool in the pan for 20 minutes before removing it from the loaf pan to cool completely.

Close up of Marbled Chocolate Banana Bread on a white chopping board with a chocolate covered knife.

Tips for Success

  • Use very ripe bananas! They should have tons of brown spots on them. The more brown spots, the sweeter the banana will be!
  • I like to heat up my banana bread in the toaster oven for a few minutes and spread butter or peanut butter over it. It’s so delicious!
  • Store in an airtight container at room temperature for up to 4 days. Make it last a little longer by keeping it in the fridge for up to a week.
  • Freeze in an airtight container or ziptop bag for up to 4 months. Thaw completely before consuming.

What makes this Banana Bread super moist:

  • Brown Sugar: In place of granulated sugar I used brown sugar to add extra moisture to the bread.
  • Sour Cream: Adds a nice richness, tang, and tons of moisture!
  • Extra Bananas: Instead of 2 or 3 bananas I add in 4 mashed bananas. They add so much moisture to the batter and extra sweetness!

How to serve this Marbled Chocolate Banana Bread

I love to serve this bread warm with some butter, Nutella, or peanut butter on top! It makes the perfect breakfast, snack, or dessert! This bread can also be frozen for up to 3 months!

Marbled Chocolate Banana Bread on a white chopping board with a chocolate covered knife.

Here are more bread recipes to enjoy!

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Chocolate Swirled Banana Bread

5 from 1 vote
Prep Time: 15 minutes
Cook Time: 1 hour
Total Time: 1 hour 15 minutes
Servings: 8 serving
Marbled Chocolate Banana Bread. Super moist banana bread swirled with chocolate!

Ingredients

  • 1/2 cup 1 stick unsalted butter, melted
  • 1 cup light brown sugar
  • 2 teaspoons vanilla extract
  • 2 large eggs
  • 4 ripe bananas mashed
  • 1/2 cup sour cream
  • 1 1/2 cups all purpose flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 2 tablespoons unsweetened cocoa powder

Instructions

  • Preheat oven to 350 degrees. Grease a 9 x 5 loaf pan and set aside.
  • Add butter to a small saucepan and cook over medium heat until light brown / caramel in color. 5-10 minutes. Make sure to keep and eye on it so butter does not burn. It also helps to use a light colored saucepan for this.
  • Pour the browned butter in a large bowl along with the sugar and vanilla, mix until combined.
  • Fold in the eggs one at a time then add in the bananas and sour cream.
  • In a large bowl combine flour, baking soda and salt.
  • Add the dry ingredients to the wet ingredients.
  • Scoop 1 cup of the batter into the bowl you used for dry ingredients. Add in cocoa powder and mix to combine.
  • Pour both batters into the prepared pan alternating between chocolate and regular. Use a butter knife to swirl.
  • Bake for 1 hour or until a toothpick comes out clean.
  • Remove from the oven and let cool in the pan for 20 minutes.
  • Take the loaf out of the pan and allow it to cool completely on a wire rack.
  • Slice bread and serve!
Nutrition Facts
Chocolate Swirled Banana Bread
Amount Per Serving
Calories 393 Calories from Fat 144
% Daily Value*
Fat 16g25%
Saturated Fat 9g56%
Cholesterol 79mg26%
Sodium 320mg14%
Potassium 327mg9%
Carbohydrates 60g20%
Fiber 3g13%
Sugar 35g39%
Protein 5g10%
Vitamin A 540IU11%
Vitamin C 5.3mg6%
Calcium 56mg6%
Iron 1.8mg10%
* Percent Daily Values are based on a 2000 calorie diet.
Course: Breakfast
Cuisine: American
Keyword: Marbled Chocolate Banana Bread

Originally published July 23, 2017

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