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Chocolate Banana Swirl Loaf Cake

  • Author: Erin
  • Total Time: 1 hour 10 minutes
  • Yield: 12 slices 1x


A delectably moist banana and sour cream batter swirled with chocolate batter to create a lovely loaf-shaped snacking cake perfect for breakfast or dessert.


  • 1 stick unsalted butter, softened
  • 1/3 cup white granulated sugar
  • 1/3 cup light brown sugar, packed
  • 2 large eggs
  • 1 teaspoon pure vanilla extract
  • 1 1/2 cups all-purpose flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 heaping cup sour cream
  • 1 cup overripe mashed bananas (from approximately 2 medium bananas)
  • 1/2 cup dark chocolate chips, melted
  • 1 tablespoon cocoa powder
  • 1/4 cup solid dark chocolate chips for topping


  1. Grease and flour a 9x5 metal pan. Preheat oven to 350F.
  2. Cream butter and both sugars until light and fluffy. Add eggs and vanilla and mix until combined.
  3. In a second medium bowl, stir together flour, baking soda, and salt. Add dry ingredients in 3 additions while mixing on low, stopping when just combined. Do not overmix.
  4. Fold in sour cream and mashed bananas.
  5. In a medium bowl, stir together melted chocolate chips and cocoa powder. Spoon in about 1 cup of banana batter and stir gently to combine.
  6. Pour half of remaining batter in prepared pan and top with big spoonfuls of chocolate batter. Top with remaining banana batter and top with more spoonfuls of chocolate batter.
  7. Use a butter knife inserted to the bottom of the pan to pull and swirl batter to make the marbled chocolate pattern. Top with chocolate chips.
  8. Bake on center rack for 50 minutes or until a toothpick inserted in center of loaf comes out with a few moist crumbs attached.
  9. Allow to cool in pan for 5 minutes, then remove loaf from pan and continue cooling on a cooling rack.


You can use milk or semi-sweet chocolate chips if you don't like dark chocolate.

  • Prep Time: 10 mins
  • Cook Time: 60 mins
  • Category: Dessert
  • Method: Oven

Keywords: banana bread, chocolate swirl, loaf cake

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