Banana Bread Brownies with Brown Butter Frosting

Three banana bread brownies stacked on top of each other.

Banana Bread Brownies with Brown Butter Frosting

These Banana Bread Brownies are soft, moist, and packed with banana flavor. Topped with a luscious brown butter frosting, they’re the perfect cross between a comforting quick bread and a rich dessert bar. Great for using up ripe bananas or making ahead for gatherings!

Course Dessert

Cuisine American

Prep Time 20

Cook Time 20

Total Time 40

Servings Brownies

Calories 511kcal

Author Rob

Equipment

Jelly roll pan
mixing bowls
Whisk
Spatula
medium saucepan

Ingredients

1 ½ cups sugar
1 cup sour cream
½ cup unsalted butter at room temperature
2 eggs
4 ripe banana mashed
2 teaspoons vanilla extract
2 cups all purpose flour
1 teaspoon baking soda
¾ teaspoon salt
½ cup chopped walnuts

Brown Butter Frosting

½ cup salted butter
3- 3 ½ cups powdered sugar more if needed
1 ½ teaspoons vanilla extract
3 tablespoons milk

Instructions

Heat oven to 375F. Grease and flour 15x10-inch jelly roll pan.
In a large bowl, beat together sugar, sour cream, butter, and eggs until creamy.
Blend in bananas and vanilla extract.
Add flour, baking soda, salt, and blend for 1 minute.
Stir in walnuts.
Spread batter evenly into pan. Bake 20 minutes or until golden brown.
Meanwhile, for frosting, heat butter in a large saucepan over medium heat until boiling. Let the butter turn a light golden brown and remove from heat immediately.
Add powdered sugar, vanilla extract and milk.
Whisk together until smooth (it should be thicker than a glaze but thinner than frosting). You can add more powdered sugar or milk if needed.
Using a spatula, spread the brown butter frosting over the warm bars (the frosting will be easier to spread while the bars are still warm).

Nutrition