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Golden Banana Sheet Cake with Nutty Brown Butter Glaze

Looking for the perfect way to use up those overripe bananas on your counter? This moist, flavor-packed Banana Sheet Cake with Brown Butter Glaze is exactly what your sweet tooth has been waiting for. It’s simple to make, full of banana goodness, and topped with a silky, nutty frosting that takes it to the next level.

If you’ve tried other banana treats like Chocolate Banana Loaf or Banana Fritters, this one’s sure to join your list of favorites. Thanks to sour cream, the texture is incredibly tender, and the warm, toasty flavor from the brown butter icing makes every bite unforgettable.

💛 Why You’ll Love This Banana Cake

A perfect use for ripe bananas you’d otherwise toss
Super moist texture, thanks to the sour cream
Simple enough for everyday baking, special enough for celebrations
That brown butter frosting—pure magic!

📝 Ingredient Highlights

Dairy: Softened butter, sour cream, milk
Bananas: The riper, the better
Sweeteners: Granulated sugar, powdered sugar
Dry Goods: Flour, baking soda, salt
Extras: Chopped walnuts or pecans, vanilla extract
Eggs: 2 large eggs

🍌 Step-by-Step Instructions

Step 1: Cream together softened butter and sugar in a large mixing bowl using a hand or stand mixer.

Step 2: Beat in the eggs, sour cream, and vanilla extract until the mixture is smooth and well blended.

Step 3: Add in flour, baking soda, and salt. Mix until just combined.

Step 4: Gently fold in mashed bananas using a spatula.

Step 5: Stir in chopped nuts if using.

Step 6: Grease or line your cake pan. Pour in the batter and spread evenly. Bake at 350°F until golden and a toothpick comes out clean.

🧈 Brown Butter Glaze Instructions

Step 7: In a saucepan, melt the butter over medium heat. Continue cooking until it turns golden brown and fragrant (watch closely to avoid burning).

Step 8: Remove from heat and whisk in powdered sugar, vanilla, and milk until smooth.

Step 9: Pour the warm glaze over the slightly cooled cake. Use a spatula to spread evenly.

Step 10: Finish with a sprinkle of chopped nuts or brown sugar if desired.

🔍 Expert Tips

The browner the banana, the better. Deep spots mean deeper flavor and moisture.
Sour cream = moisture magic. No sour cream? Plain Greek yogurt makes a great substitute.
Brown butter is key. Don’t skip this—it adds depth and a toasted flavor that ordinary frosting can’t match.
Go nut-free: Skip the walnuts or pecans if needed, or try topping with a touch of cinnamon sugar instead.