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Banana Bread Brownies
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Taft Garrett
By Taft Garrett

Banana Bread Brownies

7 steps
Cook:25min
Dense, rich banana bread bars baked in a jelly-roll pan and topped with dreamy brown butter frosting. A crowd-pleasing dessert bar with optional walnuts.
Updated at: Sat, 17 Oct 2026 21:19:28 GMT

Nutrition balance score

Unbalanced
Glycemic Index
67
Moderate
Glycemic Load
29
High

Nutrition per serving

Calories286.3 kcal (14%)
Total Fat12.5 g (18%)
Carbs42.4 g (16%)
Sugars32.9 g (37%)
Protein2.1 g (4%)
Sodium117.4 mg (6%)
Fiber0.6 g (2%)
% Daily Values based on a 2,000 calorie diet

Instructions

Step 1
Heat oven to 375°F. Grease and flour a 15 x 10-inch jelly roll pan.
Step 2
For the bars, in a large bowl, beat together sugar, sour cream, butter, and eggs until creamy.
Step 3
Blend in bananas and vanilla extract. Add flour, baking soda, and salt, and blend for 1 minute. Stir in walnuts.
Step 4
Spread batter evenly into pan. Bake 20 to 25 minutes or until golden brown.
Step 5
Meanwhile, for frosting, heat butter in a large saucepan over medium heat until boiling. Let the butter turn a delicate brown and remove from heat immediately.
Step 6
Add powdered sugar, vanilla extract, and milk. Whisk together until smooth (it should be thicker than a glaze but thinner than frosting).
Step 7
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).

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