This s’mores banana bread combines classic soft banana bread with everything you love about a campfire s’more: buttery graham crackers, melty chocolate, and a thick layer of toasted marshmallows on top.

Browned butter adds a warm, nutty flavor that works beautifully with ripe bananas and cinnamon, while Greek yogurt keeps the crumb moist and tender. The graham cracker crumbs are folded right into the batter, mini chocolate chips melt throughout the loaf, and the marshmallow topping gets toasted at the very end so it stays soft, gooey, and golden instead of disappearing into the bread.

It’s a fun dessert-style banana bread for weekend baking, parties, summer gatherings, or anytime you want something a little more indulgent than a classic loaf.

Ingredients

For the Banana Bread

3 medium very ripe bananas, mashed
½ cup (113g) salted butter, browned and slightly cooled
½ cup (100g) packed brown sugar
¼ cup (50g) granulated sugar
1 large egg (50g), room temperature
¼ cup (60g) plain Greek yogurt
1 tablespoon (13g) vanilla bean paste
1¾ cups (210g) all-purpose flour
½ cup (60g) finely crushed graham crackers
1 teaspoon (4g) baking powder
½ teaspoon (3g) baking soda
½ teaspoon (3g) fine salt
2 teaspoons ground cinnamon
¾ to 1 cup mini chocolate chips, or to taste

For the S’mores Topping

About 2 cups mini marshmallows
Additional graham crackers, broken into small pieces
Melted milk, semisweet, or dark chocolate, for drizzling
Extra mini chocolate chips, optional

How to Make S’mores Banana Bread

Step 1 – Prepare the Pan

Preheat the oven to 375°F (190°C).

Line a standard 9 x 5-inch loaf pan with parchment paper, leaving enough overhang on the long sides to lift the bread out later.

Lightly grease any exposed sides of the pan.

Step 2 – Brown the Butter

Place the salted butter in a light-colored saucepan over medium heat.

Cook, stirring or swirling frequently, until the butter foams and the milk solids at the bottom turn deep golden brown and smell nutty.

Immediately pour the browned butter into a heatproof bowl, including all the browned milk solids.

Let it cool for about 10 minutes. It should be warm, not hot.

Step 3 – Mix the Dry Ingredients

In a medium bowl, whisk together:

All-purpose flour
Crushed graham crackers
Baking powder
Baking soda
Salt
Cinnamon

Whisk until everything is evenly distributed.

Finely crushed graham crackers blend more smoothly into the crumb while still giving the loaf that recognizable s’mores flavor.

Step 4 – Mix the Banana Base

In a large bowl, whisk the mashed bananas and warm browned butter until combined.

Add the brown sugar and granulated sugar and whisk until the mixture looks smooth and glossy.

Add the egg, Greek yogurt, and vanilla bean paste.

Whisk again until completely combined.

Step 5 – Combine the Batter

Add the dry ingredients to the wet ingredients.

Using a rubber spatula, fold gently until the batter is mostly combined and just a few small streaks of flour remain.

Add the mini chocolate chips and fold only until evenly distributed and the last streaks of flour disappear.

Do not overmix. The batter should look thick and slightly lumpy rather than perfectly smooth.

Step 6 – Fill the Loaf Pan

Transfer the batter to the prepared loaf pan.

Spread it into an even layer and smooth the top gently with a spatula.

For an extra chocolatey loaf, sprinkle a small handful of mini chocolate chips over the top before baking.

Step 7 – Start at High Heat

Bake at 375°F (190°C) for 5 minutes.

Without opening the oven for long, reduce the temperature to:

350°F (175°C)

Continue baking for approximately 40–50 minutes.

Start checking around the 40-minute mark.

The loaf is ready for the marshmallow topping when:

the top is risen and set,
the center no longer looks wet,
and a toothpick inserted into the center comes out with a few moist crumbs rather than raw batter.

If the loaf becomes too dark before the center is done, loosely tent the top with foil.

Step 8 – Add the Marshmallow Topping

Remove the loaf from the oven once it is nearly fully baked.

Cover the surface generously with about 2 cups mini marshmallows, pressing them very lightly into the top so they stay in place.

Return the loaf to the oven at 350°F (175°C) for about 4–5 minutes, until the marshmallows are puffed and beginning to melt.

For a more deeply toasted s’mores finish, switch the oven to broil for just a few seconds at the end.

Watch constantly. Marshmallows can go from golden to burned very quickly.

Step 9 – Cool

Let the loaf cool in the pan for about 15 minutes.

Use the parchment overhang to carefully lift it from the pan and transfer it to a wire rack.

Let it cool for at least another 30–45 minutes before slicing.

The loaf will continue setting as it cools, and slicing it too early can make the center seem overly soft or gummy.

Step 10 – Decorate

Once the loaf is warm rather than piping hot, tuck small pieces of graham cracker into the marshmallow topping.

Drizzle with melted chocolate.

Finish with extra mini chocolate chips if desired.

For the best s’mores appearance, leave some toasted marshmallows exposed rather than covering the entire loaf with chocolate.

Chef’s Tips for the Best S’mores Banana Bread

Use very ripe bananas. Bananas with heavily speckled or mostly brown peels provide the best sweetness and banana flavor.
Include the browned milk solids. Those golden bits contain most of the toasted flavor from browned butter.
Crush the graham crackers finely. Large chunks in the batter can create dry pockets.
Don’t overmix. Fold only until the flour disappears to keep the crumb soft and tender.
Watch the loaf after 40 minutes. Banana breads vary depending on banana moisture, pan material, and oven accuracy.
Use the toothpick test correctly. Moist crumbs are ideal; wet batter is not.
Add marshmallows at the end. Baking them for the entire time would cause them to melt away or burn.
Broil carefully. Stay next to the oven while toasting the marshmallows.
Cool before slicing. The loaf needs time to set, especially with moist banana and melted chocolate inside.

The Secret to Soft, Moist Banana Bread

The key is controlling both mixing and moisture.

Bananas and Greek yogurt already bring a lot of moisture to the batter. Once flour is added, aggressive stirring develops gluten and can turn that moisture into a dense or slightly rubbery crumb.

Folding just until combined keeps the structure tender while still allowing enough gluten development for the loaf to rise and hold together.

The Greek yogurt also adds acidity, which works with the baking soda and helps create a softer crumb.

The Secret to a True S’mores Topping

The marshmallows should be treated as a finishing layer, not as part of the main bake.

If they go on too early, they can melt into the batter, disappear, or become overly dark before the loaf is finished.

Adding them only once the banana bread is nearly baked lets them puff and toast while keeping their distinct marshmallow texture.

A very short broil at the end creates that campfire-style caramelized surface without drying out the loaf underneath.

Delicious Variations

Peanut Butter S’mores

Swirl ¼ cup creamy peanut butter into the batter before baking.

Chocolate, peanut butter, banana, and toasted marshmallow work especially well together.

Double Chocolate

Replace ¼ cup of the flour with unsweetened cocoa powder and add extra chocolate chips.

The loaf will have a deeper brownie-like s’mores flavor.

Dark Chocolate S’mores

Use dark chocolate chips and dark chocolate drizzle for a less sweet finish.

Cinnamon Graham

Increase the cinnamon slightly and use cinnamon graham crackers for an even warmer flavor.

Salted S’mores

Finish the melted chocolate drizzle with a very light sprinkle of flaky sea salt.

Nutty S’mores

Fold in ½ cup chopped toasted pecans or walnuts with the chocolate chips.

What to Serve With S’mores Banana Bread

This loaf is rich enough to serve as dessert but also works well as a sweet snack.

Try it with:

Hot coffee
Cold milk
Espresso
Vanilla ice cream
Fresh strawberries
Fresh raspberries
A lightly sweetened latte

For dessert, serve a slightly warm slice with vanilla ice cream and a little extra chocolate sauce.

Make-Ahead Tips

The banana bread itself can be baked 1 day ahead.

For the best-looking marshmallow topping, you can bake the loaf without the marshmallows, then add and toast them shortly before serving.

If you make the entire loaf ahead, let it cool completely before covering.

Do not wrap a warm marshmallow-topped loaf tightly in plastic wrap, since the marshmallows can become sticky and pull away from the surface.

Storage

Room Temperature

Store the cooled loaf in an airtight container at room temperature for up to 2 days.

Because the marshmallow topping becomes stickier over time, place a piece of parchment loosely over the top before closing the container.

Refrigerator

For longer storage, refrigerate the loaf for up to 4–5 days.

The marshmallows will firm up in the refrigerator, so let slices sit at room temperature briefly or warm them gently before serving.

Freezer

The banana bread itself freezes well, but the toasted marshmallow topping does not freeze particularly well.

For best results, freeze the loaf without the marshmallow topping.

Wrap tightly and freeze for up to 2 months.

Thaw completely, then add fresh marshmallows and toast before serving.

How to Reheat

For one slice, microwave for about 10–15 seconds until just slightly warm.

Avoid overheating, since the marshmallows and chocolate can become extremely hot.

For several slices, warm them in a 300°F (150°C) oven for about 5–8 minutes.

Notes

Yield: 1 standard loaf, about 8–10 slices.
Pan: A 9 x 5-inch loaf pan is ideal.
Bananas: Three medium bananas should give roughly 1¼ cups mashed banana.
Chocolate chips: About ¾–1 cup works well, but the amount can be adjusted to taste.
Marshmallows: About 2 cups creates a generous s’mores-style topping.
Vanilla: Vanilla bean paste gives beautiful flavor, but regular vanilla extract can be substituted 1:1.
Graham crackers: Crush them finely for the batter and reserve larger pieces for decorating.
Doneness: A few moist crumbs on the toothpick are good; visible wet batter means the loaf needs more time.
Tenting: If the top is browning too quickly before the center is baked, loosely cover it with foil.
Presentation: For the prettiest finish, leave the toasted marshmallows visible, add a few angled graham cracker pieces, and drizzle the chocolate in thin uneven ribbons so the loaf still looks homemade and gooey rather than overly decorated.

S’mores Banana Bread – Gooey, Toasted & Loaded with Chocolate