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Jul 6, 2026 by JCP

Brown Butter Frosted Banana Bars

Hey, y'all! If you've got a few ripe bananas on the counter, these Brown Butter Frosted Banana Bars are the perfect way to put them to good use. They're soft, moist, and packed with banana flavor, then topped with a rich brown butter frosting that makes every bite even better.

Brown Butter Frosted Banana Bars

Brown Butter Frosted Banana Bars
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The combination of ripe bananas and brown butter creates a flavor that's warm, rich, and just a little nostalgic. It's the kind of homemade dessert that's hard to stop eating after the first bite.

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Brown Butter Frosted Banana Bars

Brown Butter Frosted Banana Bars Ingredients

For the Bars:

  • 1 ½ c. sugar
  • 1 c. sour cream
  • ½ c. salted butter, softened
  • 2 eggs
  • 3 ripe bananas
  • 2 tsp. vanilla extract
  • 2 c. flour
  • 1 tsp. baking soda
  • 1 c. chopped walnuts

For the Frosting:

  • ½ c. butter
  • 3 c. powdered sugar
  • 1 tsp. vanilla extract
  • 3 tbsp. milk
Brown Butter Frosted Banana Bars

How to Make Brown Butter Frosted Banana Bars

  1. Preheat the oven to 375°F. Line a 9×13-inch baking pan with parchment paper.
  2. In a large mixing bowl, beat the butter and sugar until light and fluffy. Mix in the sour cream and eggs, then stir in the mashed bananas and vanilla.
  3. Add the flour and baking soda, mixing just until combined. Fold in the walnuts.
  4. Spread the batter evenly into the prepared pan and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean. Let the bars cool completely.
  5. To make the frosting, melt 1 stick of butter in a saucepan over medium heat, cooking until it turns golden brown and develops a nutty aroma. Remove from the heat and whisk in the powdered sugar, one cup at a time. Add the vanilla and milk, whisking until smooth.
  6. Spread the frosting over the cooled bars. Let it set before slicing and serving.
Brown Butter Frosted Banana Bars

Pro Tips For Making This Recipe

  1. Brown the butter until it's golden and fragrant for the best frosting.
  2. Use very ripe bananas for the sweetest flavor and moistest bars.
  3. Mix just until the flour is incorporated to keep the bars tender.
  4. Substitute pecans for walnuts, or leave the nuts out altogether.
  5. Fold in chocolate chips for an extra indulgent treat.
Brown Butter Frosted Banana Bars

Frequently Asked Questions

Can I make these ahead of time?

You sure can! They store well, and the flavor gets even better the next day.

Can I use unsalted butter?

Absolutely! Just add a pinch of salt to the batter and frosting.

Can I leave out the nuts?

You sure can! They're optional, and the bars are delicious either way.

What if my frosting is too thick?

Add a splash more milk until it reaches a pourable consistency.

Brown Butter Frosted Banana Bars

Other Recipes You'll Love

  1. Banana Pudding Parfait
  2. Lemon Cheesecake Bars
  3. Southern Hummingbird Cake
Brown Butter Frosted Banana Bars

Recipe

Brown Butter Frosted Banana Bars

Brown Butter Frosted Banana Bars

JC Phelps
My Brown Butter Frosted Banana Bars are soft, sweet, and topped with a rich, nutty frosting that takes them over the top.
No ratings yet
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Prep Time 20 minutes mins
Cook Time 30 minutes mins
Total Time 50 minutes mins
Course Dessert
Cuisine American
Servings 12
Calories 839 kcal

Ingredients
  

For the Bars:

  • 1 ½ c. sugar
  • 1 c. sour cream
  • ½ c. salted butter softened
  • 2 eggs
  • 3 ripe bananas
  • 2 tsp. vanilla extract
  • 2 c. flour
  • 1 tsp. baking soda
  • 1 c. chopped walnuts

For the Frosting:

  • ½ c. butter
  • 3 c. powdered sugar
  • 1 tsp. vanilla extract
  • 3 tbsp. milk

Instructions
 

  • Preheat the oven to 375°F. Line a 9×13-inch baking pan with parchment paper.
  • In a large mixing bowl, beat the butter and sugar until light and fluffy. Mix in the sour cream and eggs, then stir in the mashed bananas and vanilla.
  • Add the flour and baking soda, mixing just until combined. Fold in the walnuts.
  • Spread the batter evenly into the prepared pan and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean. Let the bars cool completely.
  • To make the frosting, melt 1 stick of butter in a saucepan over medium heat, cooking until it turns golden brown and develops a nutty aroma. Remove from the heat and whisk in the powdered sugar, one cup at a time. Add the vanilla and milk, whisking until smooth.
  • Spread the frosting over the cooled bars. Let it set before slicing and serving.

Notes

  • Brown the butter until it's golden and fragrant for the best frosting.
  • Use very ripe bananas for the sweetest flavor and moistest bars.
  • Mix just until the flour is incorporated to keep the bars tender.
  • Substitute pecans for walnuts, or leave the nuts out altogether.
  • Fold in chocolate chips for an extra indulgent treat.

Nutrition

Calories: 839kcalCarbohydrates: 129gProtein: 9gFat: 34gSaturated Fat: 14gPolyunsaturated Fat: 10gMonounsaturated Fat: 7gTrans Fat: 1gCholesterol: 82mgSodium: 260mgPotassium: 283mgFiber: 3gSugar: 93gVitamin A: 684IUVitamin C: 3mgCalcium: 61mgIron: 3mg
Keyword Brown Butter Frosted Banana Bars
Tried this recipe?Let us know how it was!

Y'all come back now, ya hear?

My best,

JC

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JC Phelps Kentucky Blogger

Hey, y’all! I’m Dr. JC Phelps, though most folks on the internet know me as JCP Eats. I’m a proud Kentuckian, a fiercely loyal Southerner, and quite possibly the biggest mayonnaise fan below the Mason-Dixon Line. I started JCP Eats as a place to share the recipes, traditions, and flavors I grew up with, along with the dishes that have found a permanent place at my table. I’m so glad you’re here. Welcome to my Kentucky kitchen!

Learn more about JC here.

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