Banana Bars with Brown Butter Frosting

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  • Soft banana bars with a rich brown butter frosting. My favorite way to use up ripe bananas. These bars have the best banana flavor and never last long!

    These banana bars are one of my absolute favorite desserts. They’re moist, soft and are topped with a delicious brown butter frosting. I also love pumpkin bars, sugar cookie bars, congo bars and s’mores bars. Seriously so delicious!

    banana bars with brown sugar frosting and banana slice on top

    Banana bars

    Whenever I spot a bunch of brown bananas at the store or end up with some on my counter, I know exactly what I want to make: frosted banana bars! As much as I love banana bread (especially with chocolate chips), these banana bars are always on my mind.

    What takes them over the top is the rich and creamy brown butter frosting. It adds the best flavor and is seriously divine!

    The only problem with these bars is that they make a lot, so I have to find a place to take them or I will eat the entire pan! You can definitely cut this recipe in half and bake them in a 9×9″ pan, but I love to make the whole sheet. They’re great to make for a crowd and both adults and kids always love them!

    folding in mashed bananas to banana bar batter with a spatula

    How to make banana bars

    Step 1: Combine wet ingredients

    Cream together the butter and sugars in a large bowl. Next add in eggs, sour cream and vanilla and mix just until combined.

    Step 2: Combine dry ingredients

    In a separate bowl, whisk together the flour, baking soda, baking powder, salt and cinnamon. Slowly add the flour mixture to the wet mixture and stir just until smooth. Fold in the mashed bananas and then pour into a greased large rimmed 12×18″ baking sheet.

    Step 3: Bake banana bars 

    Bake at 350°F for 20-25 minutes, or until a toothpick comes clean and the top is golden. Remove from oven and allow the bars to cool completely.

    pouring brown butter frosting on top of banana bars

    Brown butter frosting

    I love to top my banana bars with a brown butter frosting. Brown butter adds a deep, rich flavor to baked goods and is seriously delicious. And while on the topic of brown butter, have you tried my brown butter chocolate chip cookies? They are life changing!

    Ingredients

    •  1/2 cup unsalted butter
    • 3 1/2 -4 cups powdered sugar
    • 3-4 Tablespoons milk
    • 2 teaspoons pure vanilla extract
    • pinch of salt

    Instructions

    Melt the butter in a large sauce pan over medium-heat. Cook for about 3-4 minutes, until it has turned a golden brown color and has a nutty aroma. As soon as you notice the color change, quickly remove the pan from heat to prevent it from burning.

    Then whisk in the powdered sugar, milk and vanilla. Pour the brown butter frosting immediately over the bars and spread evenly with a spatula. Move quickly, as the frosting will thicken fast. Cover until ready to serve.

    slices of frosted banana bars on a baking sheet

    Tips for the best banana bread bars

    • Use ripe bananas! The riper they are, the more sweetness they add.
    • This recipe makes a lot! Feel free to cut it in half and bake in a 9×9″ pan.
    • Can add chopped walnuts or pecans to banana bar batter.
    • Brown sugar frosting thickens fast, so move quickly! Pour immediately on top of bars.
    • Cream cheese frosting also tastes great on top of banana bars as well.
    • Add banana slices on top right before serving so they don’t get soggy and brown.

    frosted banana bar with a bite taken out

    More banana recipes:

    Banana Bars Recipe

    Course: Dessert
    Cuisine: American
    Keyword: Banana bars, banana bars recipe, brown butter frosting
    Prep Time: 20 minutes
    Cook Time: 25 minutes
    Total Time: 45 minutes
    Servings: 35 bars
    Calories: 132
    Author: Jamielyn Nye
    Soft banana bars with a rich brown butter frosting. My favorite way to use up ripe bananas. These bars have the best banana flavor and never last long!

    Ingredients

    For the banana bars:

    • 1/2 cup unsalted butter , at room temperature (plus more for the pan)
    • 1 cup granulated sugar
    • 1/2 cup light brown sugar
    • 2 large eggs
    • 1 cup sour cream
    • 1 1/2 teaspoons vanilla extract
    • 2 1/4 cups all-purpose flour
    • 1 teaspoon baking soda
    • 1/2 teaspoon baking powder
    • 1/2 teaspoon salt
    • 1/2 teaspoon ground cinnamon
    • 2 cups mashed ripe bananas (about 5 brown bananas)

    Brown butter frosting:

    • 1/2 cup unsalted butter
    • 3 1/2 to 4 cups powdered sugar
    • 3-4 Tablespoons milk
    • 2 teaspoons pure vanilla extract
    • pinch of salt

    Instructions

    • Preheat the oven to 350°F. Butter a large rimmed baking sheet (12×18″). In a large bowl, cream together the butter, sugar and brown sugar. Add the eggs, sour cream and vanilla. Mix just until combined.
    • In a separate bowl, whisk together the flour, baking soda, baking powder, salt and cinnamon. Slowly add the flour mixture into the other bowl and stir just until smooth. Fold in the mashed bananas and then pour into the baking sheet.
    • Bake for 20-25 minutes, or until a toothpick comes clean and the top is golden. Remove from oven and allow the bars to cool completely.
    • For the brown butter frosting, melt the butter in a large sauce pan over medium heat. Cook for about 3-4 minutes, until the butter has turned a golden brown and has a nutty aroma. As soon as you notice the color change, quickly remove the pan from heat to prevent it from burning.
    • Whisk in the powdered sugar, milk and the vanilla. Pour immediately over the bars and spread evenly with a spatula. Move quickly, as the frosting will thicken fast. Cover until ready to serve.

    Video

    Notes

    • This recipe makes a lot! Feel free to cut it in half and bake in a 9x9" pan.
    • Cream cheese frosting also tastes great on top of banana bars as well.
    • Add banana slices on top right before serving so they don't get soggy and brown.

    Nutrition

    Calories: 132kcal | Carbohydrates: 16g | Protein: 1g | Fat: 6g | Saturated Fat: 4g | Cholesterol: 26mg | Sodium: 75mg | Potassium: 79mg | Sugar: 8g | Vitamin A: 225IU | Vitamin C: 1.2mg | Calcium: 19mg | Iron: 0.5mg
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    stack of frosted banana bars with fresh banana slices on top

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