These Browned Butter Banana Bread Bars are a delightful twist on classic banana bread. They bake up with a tender, moist crumb and are finished with a rich, nutty browned-butter frosting. Perfect for using overripe bananas, these bars make a great snack or simple dessert to share.
Why these Browned Butter Banana Bread Bars
If you love banana bread, these browned-butter banana bars will quickly become a favorite. They have a cake-like texture, pronounced banana flavor, and a silky browned-butter frosting that elevates the whole recipe.
You can make these without an electric mixer. Browning the butter for both the batter and the frosting adds a toasty, caramel-like depth that tastes more complex than the effort requires. These bars are an easy way to satisfy banana cravings and turn overripe bananas into something special.
Ingredients and substitutions
For the banana bread bars:
- Unsalted butter — browned for flavor; you can use salted butter but reduce the added salt slightly.
- White sugar and light brown sugar — the combination keeps the bars moist and flavorful.
- Eggs — room temperature is best.
- Sour cream — adds richness and moisture; plain Greek yogurt works as a substitute.
- Mashed ripe bananas — the riper, the better for banana flavor.
- Pure vanilla extract — for warmth and depth.
- All-purpose flour — you may substitute part with whole wheat for a denser texture.
- Baking soda and fine sea salt — ensure proper rise and balance the sweetness.
For the browned-butter frosting:
- Butter — browned again to match the batter’s flavor.
- Powdered sugar — sifted for a smooth frosting.
- Vanilla extract — classic flavor note.
- Half-and-half or milk — to thin the frosting; non-dairy milk works, too.
Optional topping:
- Finely chopped pecans or walnuts for crunch and extra richness.
Directions
For the browned-butter banana bread bars:
Preheat the oven to 350°F (175°C). Line or grease a 9×13-inch baking pan.
Melt ½ cup (1 stick) butter in a saucepan over medium heat. Cook, stirring occasionally, until the butter becomes foamy, smells nutty, and turns a light golden brown. Remove from heat and transfer to a heatproof bowl.
Whisk the browned butter with 1 cup white sugar and ½ cup packed light brown sugar until combined. Whisk in 2 large eggs. Stir in 1 cup sour cream, 1½ cups mashed ripe bananas (about 4 bananas), and 1 teaspoon vanilla.
In a separate bowl, whisk together 2 cups all-purpose flour, 1 teaspoon baking soda, and ½ teaspoon fine sea salt. Gradually fold the dry ingredients into the wet mixture until just combined — a few streaks of flour are fine. Avoid overmixing.
Pour the batter into the prepared pan and bake 25–30 minutes, or until a toothpick inserted in the center comes out clean or with a few dry crumbs. Let the bars cool slightly before frosting.
For the browned-butter frosting:
Brown 4 tablespoons butter in the same saucepan over medium heat, stirring until it is fragrant and light golden. Remove from heat, stir in 1 teaspoon vanilla, then whisk in 2 cups sifted powdered sugar until smooth. Add 1–2 tablespoons half-and-half or milk, one tablespoon at a time, until the frosting reaches your desired consistency.
Pour the frosting over the warm bars and spread to the edges. Sprinkle with finely chopped pecans or walnuts if desired. Allow the frosted bars to cool for about 30 minutes before slicing so the frosting sets.
How to bake on a sheet pan
To stretch the recipe for a crowd or create thinner bars with more frosting surface, use a standard sheet pan (about 10×15 inches):
- Line the sheet pan with parchment paper or spray with cooking spray.
- Spread the batter evenly; it will be thinner than in a 9×13 pan—use a spatula to smooth it.
- Check for doneness earlier—begin checking at 18–20 minutes. A toothpick should come out clean or with a few moist crumbs.
- Frost while still warm for easier spreading.
- Slice into small squares or bars for potlucks or picnics.
Baking in a sheet pan is an excellent way to feed more people with the same batter.
Variations
- Stir in chocolate chips or swirl peanut butter into the batter for a different flavor profile.
- If you’re short on time, a store-bought cream cheese frosting or another favorite topping will also work.
Tips for success
- Use very ripe bananas with brown spots for the best flavor and natural sweetness.
- Avoid overmixing the batter to keep the bars soft and tender.
- Let the bars cool slightly before frosting so the frosting spreads smoothly without melting away.
- Store leftovers in an airtight container at room temperature to maintain moisture.
How to store
Keep the bars in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate up to 5 days or freeze (with or without frosting) for up to 2 months. Bring to room temperature before serving for the best texture.
More banana recipes
- Healthy Zucchini Banana Bread
- No Bake Banana Pudding
- No Bake Banana Cream Pie
- Banana Pumpkin Bread
📖 Recipe
Browned Butter Banana Bread Bars
Ingredients
For the bars:
- ½ cup unsalted butter (1 stick)
- 1 cup white sugar
- ½ cup packed light brown sugar
- 2 large eggs
- 1 cup sour cream
- 1½ cups mashed ripe bananas (about 4)
- 1 teaspoon pure vanilla extract
- 2 cups all-purpose flour
- 1 teaspoon baking soda
- ½ teaspoon fine sea salt
For the frosting:
- 4 tablespoons butter
- 2 cups powdered sugar, sifted
- 1 teaspoon vanilla extract
- 1–2 tablespoons half-and-half or milk, to thin
- Optional: finely chopped pecans or walnuts
Instructions
- Preheat the oven to 350°F (175°C). Prepare a 9×13-inch pan with cooking spray or parchment.
- Brown ½ cup butter in a saucepan until foamy and light golden. Transfer to a heatproof bowl and whisk with both sugars.
- Whisk in the eggs, then stir in sour cream, mashed bananas, and vanilla.
- In another bowl, whisk flour, baking soda, and salt. Fold dry ingredients into the wet mixture until just combined; do not overmix.
- Pour batter into the prepared pan and bake 25–30 minutes, until a toothpick comes out clean. Cool slightly.
- For the frosting, brown 4 tablespoons butter, add vanilla, then sifted powdered sugar. Add half-and-half a tablespoon at a time until smooth. Pour over warm bars and spread to the edges. Add chopped nuts if desired. Cool about 30 minutes before slicing.
Notes
- Use very ripe bananas for the best flavor.
- Do not overmix the batter to keep the bars tender.
- Let the bars cool slightly before frosting so it spreads evenly.
- Store leftovers in an airtight container to keep them moist.
Nutrition (per serving)
- Calories: 433 kcal
- Carbohydrates: 51 g
- Protein: 9 g
- Fat: 22 g
- Saturated Fat: 13 g
- Sodium: 319 mg