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Banana Bars with Brown Butter Frosting

The absolute BEST banana bars. Made with ripe bananas and topped with brown butter frosting for the perfect banana bar recipe. 

Course Dessert
Cuisine American
Keyword banana, banana bread, bars, brown butter, brownies, cake, dessert, frosting
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 12 people


For the cake:

  • 1-1/2 cup sugar
  • 1/2 cup butter, soft
  • 1 cup sour cream
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 3 ripe bananas, mashed
  • 2 cups all-purpose flour
  • 1 teaspoon salt
  • 1 teaspoon baking soda

For the frosting:

  • 1/2 cup butter
  • 4 cups powdered sugar
  • 2 teaspoons vanilla extract
  • 6 Tablespoons milk


For the cake:

  1. Preheat your oven to 375 degrees. Prep a large jelly roll pan and set aside.

  2. Combine the sugar and butter in a mixing bowl. Whisk 1 minute or until light and fluffy. Add the sour cream and stir until combined. 

  3. Add the eggs, one at a time, along with the vanilla extract. Stir in the mashed bananas. 

  4. Whisk in the flour, salt, and baking soda. Stir until fully incorporated. Spread into your prepared pan and bake 20-25 minutes or until a toothpick comes out clean.

For the frosting:

  1. Add the butter to a pot. Cook, mixing occasionally, until the butter turns a light brown color. Remove from the heat. 

  2. Whisk in the powdered sugar, vanilla, and milk until smooth. Spread onto a cooled cake.