Banana Bread Brownies with Brown Butter Frosting

Mashed banana goes in brownie batter and suddenly everything gets soft and spongy in the best way. Brown butter frosting on top. That’s it. Takes 37 minutes total — 15 to prep, 22 in the oven — and you’ve got something that tastes like someone actually cared.

Why You’ll Love These Banana Brownies With Brown Butter Frosting

Dense and fudgy but somehow light at the same time. Walnut pieces break up the softness. The frosting is nutty and melts a little on the warm brownies. Comfort food that doesn’t feel heavy.

Makes enough to eat one now and hide the rest in a container so nobody finds it for three days. Cold ones are actually better — the flavor sits there longer.

Cleanup’s easy. One bowl for dry stuff, one for wet, one pan. Done.

What You Need for Banana Brownies With Brown Butter Frosting

Two cups flour. Baking powder and baking soda — a teaspoon of each. Cinnamon. Salt. Not much, just enough.

Butter. Half a cup softened. Then another half cup for the frosting later.

Brown sugar and regular sugar. Half cup each. The brown sugar matters — it’s got molasses, makes everything taste older somehow.

Two eggs. A cup of mashed banana — really ripe, the kind with brown spots. Yogurt instead of buttermilk. Vanilla. Walnuts. A cup chopped.

For frosting: powdered sugar, half and half cream, vanilla. That’s the whole frosting.

You could use buttermilk if you have it. Yogurt works the same way — adds tang, keeps things tender.

How to Make Banana Brownies With Brown Butter Frosting

Heat the oven to 350 degrees. Grab a 9x13 pan. Spray it or line it with parchment. Butter works too.

Whisk together flour, baking powder, baking soda, cinnamon, salt in a medium bowl. Set it aside and don’t touch it yet.

In a big bowl — bigger than you think you need — beat the softened butter with both sugars until it’s lighter and fluffy. Don’t go crazy. Just until it looks pale and holds air. Maybe two minutes.

Add eggs one at a time. Mix after each one. Stir in the mashed banana, yogurt, vanilla. The batter smells like a ripe fruit now, a bit tangy from the yogurt.

Getting the Texture Right on Banana Brownies

Pour the flour mixture in gradually. Fold it. Or mix it. But stop once you can’t see the flour anymore. Overmixing makes them tough. You want tender.

Fold in the walnuts gently. Save a few to sprinkle on top if you want extra crunch on the surface.

Pour it all into the pan. Spread it even. Bake for 22 minutes. They’re done when the edges are golden and pulling away slightly from the sides. Stick a toothpick in the middle — it shouldn’t come out clean. Should have moist crumbs on it. Not wet batter. Moist crumbs.

While they’re baking, make the brown butter frosting. Half a cup butter in a skillet over medium heat. Watch it the whole time. It melts, then bubbles, then foams. The color shifts from pale yellow to this deep amber. That’s when it smells nutty and good. Pull it off the heat immediately. Don’t let it go brown-black. That’s burnt.

Off heat, whisk in the powdered sugar, cream, and vanilla until it’s smooth and spreadable.

The brownies come out warm. Spread the frosting on while they’re still warm — it settles into the cracks, melts slightly. If you wait until they cool down, the frosting gets thick and doesn’t spread right.

Let them cool all the way before cutting. Store them in an airtight container. They stay moist for days.

Tips for Banana Brownies and Common Mistakes

Don’t use bananas that are still yellow. You need the brown-spotted ones. The sugar’s higher, it tastes better.

Overmixing the batter after you add the flour is the main thing that kills this. Stop as soon as you can’t see streaks.

Brown butter burns fast. It goes from perfect to burnt in like 30 seconds. Watch it the entire time. Smell is your best guide — when it smells nutty and good, it’s done.

If the frosting cools too much before you spread it, it gets thick and lumpy. Warm pan usually fixes it. Or just accept that it’ll be textured. Still tastes the same.

Walnuts are right for this. Pecans work. Don’t use almonds — different flavor entirely, throws the whole thing off.

Banana Bread Brownies with Brown Butter Frosting

By Emma

Prep:

15 min

Cook:

22 min

Total:

37 min

Servings:

24 servings

Ingredients

• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1/2 teaspoon salt
• 1/2 cup unsalted butter softened
• 1/2 cup brown sugar packed
• 1/2 cup granulated sugar
• 2 large eggs
• 1 cup very ripe mashed banana (about 2-3 medium bananas)
• 1/2 cup plain yogurt (substitute for buttermilk)
• 2 teaspoons vanilla extract
• 1 cup chopped walnuts
• 1/2 cup unsalted butter (for frosting)
• 2 cups powdered sugar
• 1/3 cup half and half cream
• 1 teaspoon vanilla extract

Method

1. 1 Heat oven to 350F. A 9x13 pan sprayed or lined with parchment, or buttered thoroughly.
2. 2 Whisk flour, baking powder, baking soda, cinnamon, salt in medium bowl. Set aside.
3. 3 In big bowl, beat softly softened butter and both sugars until lighter, fluffy but don’t overdo or it can get greasy.
4. 4 Add eggs one at a time, mixing well after each. Stir in mashed banana, yogurt, vanilla. The batter will smell like ripe fruit and a bit tangy now.
5. 5 Gradually sift in flour mixture, folding or mixing until just combined. Overmixing kills tenderness here.
6. 6 Fold in walnuts gently. Save a few to sprinkle on top if you like extra crunch.
7. 7 Pour batter into pan, spread evenly. Bake around 22 minutes. Look for golden edges pulling slightly away from sides. Tester won't come out dry but with moist crumbs.
8. 8 While baking, melt frosting butter in skillet over medium. Watch carefully— it bubbles then foams, swirls turn from pale yellow to deep amber. Nutty smell is key. Remove immediately; don’t burn.
9. 9 Off heat, whisk in powdered sugar, half and half, and vanilla till smooth, spoonable frosting forms.
10. 10 Once brownies out and still warm, spread frosting thinly with spatula. If it cools too much first, frosting thickens and doesn't spread well.
11. 11 Let cool fully for cutting. Store airtight to retain moisture.

Nutritional information

Calories

230

Protein

3g

Carbs

34g

Fat

10g

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Frequently Asked Questions About Banana Brownies With Brown Butter Frosting

Can I make these without walnuts? Yeah. They’ll be softer without the crunch but they still work fine. Maybe add a tiny bit of salt to the batter if you do.

How ripe should the bananas actually be? Brown spots. Soft. Like, almost too soft to peel. That’s the one.

Can I use melted butter instead of softened? It’ll change the texture. Melted butter makes them denser. Not bad. Just different. Try it once if you want.

What if I don’t have half and half for the frosting? Milk works. Heavy cream works. Even sour cream works but tastes sharper. Depends what you’re going for.

Do these freeze? Yeah. They freeze fine for like a month. Thaw them at room temperature.

Can I double this recipe? Sure. Use a 9x13 and a smaller pan, or split it between two pans. Timing stays the same — still 22 minutes. Check the smaller pan a minute earlier though.