Decadent brownies with marshmallows are the ultimate comfort dessert—rich, fudgy, and crowned with gooey, toasted marshmallows that melt into pure sweetness. Whether you’re a baking beginner or a seasoned pro, this crowd-pleasing treat is easy to make and impossible to resist.
This is a comprehensive guide about brownies with marshmallows.
Key Takeaways
- Perfect texture balance: Fudgy brownie base meets soft, melty marshmallows for a satisfying bite every time.
- Quick and easy recipe: Ready in under an hour with simple ingredients you likely already have at home.
- Customizable flavors: Add chocolate chips, nuts, or a pinch of sea salt to elevate your brownies with marshmallows.
- Great for sharing: Ideal for parties, potlucks, or cozy nights in—these brownies always disappear fast.
- Kid-friendly baking project: Fun and safe for little hands to help with mixing and marshmallow topping.
- Storage tips: Keep in an airtight container for up to 5 days, or freeze for longer freshness.
- Toasting option: Use a kitchen torch or broiler for lightly golden marshmallows that add a smoky-sweet finish.
[FEATURED_IMAGE_PLACEHOLDER]
Why Everyone Loves Brownies with Marshmallows
There’s something magical about biting into a warm, fudgy brownie only to discover a layer of soft, gooey marshmallows clinging to your fork. It’s like a campfire s’more, but upgraded—indoors, anytime, and with zero sticky fingers (well, almost). Brownies with marshmallows have become a beloved dessert staple, and it’s easy to see why. They combine the deep, chocolatey richness of a classic brownie with the playful sweetness of marshmallows, creating a treat that’s both comforting and indulgent.
What makes these brownies so special isn’t just the taste—it’s the experience. The contrast between the dense, moist brownie base and the pillowy, melt-in-your-mouth marshmallow topping creates a texture explosion that keeps you coming back for one more bite. Whether you’re serving them at a birthday party, packing them in a lunchbox, or enjoying them with a glass of cold milk on a rainy afternoon, brownies with marshmallows deliver pure dessert joy.
The Secret to Perfect Fudgy Brownies
Before we even talk about marshmallows, let’s get the foundation right: the brownie itself. A great brownie with marshmallows starts with a fudgy, not cakey, base. The difference lies in the ingredients and technique.
Use the Right Fat
Butter is your best friend here. Melted butter (not oil) gives brownies that rich, dense texture we all crave. It also helps create a shiny, crackly top—especially when combined with a bit of sugar. For extra decadence, use a mix of butter and a small amount of cocoa butter if you’re feeling fancy.
Don’t Overmix the Batter
Once you add the flour, mix just until combined. Overmixing develops gluten, which leads to a tougher, cake-like texture. We want fudgy, not fluffy. A few lumps in the batter? Totally fine—they’ll disappear during baking.
Choose High-Quality Chocolate
Splurge on good chocolate. Whether you use melted dark chocolate bars or high-quality cocoa powder, the flavor will shine through. A 60–70% cacao bar works beautifully, giving you deep chocolate notes without being too bitter.
Bake Just Until Set
The key to fudgy brownies is underbaking—just slightly. They should look set around the edges but still jiggle gently in the center when you tap the pan. They’ll continue cooking from residual heat as they cool, so pulling them out a minute early is better than overbaking.
Marshmallows: The Star of the Show
Now, let’s talk about the marshmallows. They’re not just a topping—they’re the transformative element that turns a great brownie into an unforgettable one.
Types of Marshmallows to Use
You’ve got options. Mini marshmallows are perfect for even coverage and quick melting. Large marshmallows can be cut into chunks for a more rustic look. For a gourmet twist, try flavored marshmallows like vanilla bean, strawberry, or even cinnamon. Just make sure they’re soft and fresh—stale marshmallows won’t melt properly.
When to Add Them
Timing is everything. Add marshmallows during the last 5–7 minutes of baking. This gives them enough time to soften, puff up, and lightly toast without burning. If you add them too early, they’ll dissolve into the batter. Too late, and they won’t melt at all.
Toasting for Extra Flair
Want that campfire s’more vibe? Use a kitchen torch to lightly toast the marshmallows after baking. Hold the flame about 6 inches away and move it in quick circles. You’ll get beautiful golden spots and a hint of smokiness that elevates the whole dessert. No torch? Pop the pan under the broiler for 1–2 minutes—just watch closely to avoid burning.
Simple Recipe for Decadent Brownies with Marshmallows
Ready to bake? Here’s a foolproof recipe that delivers rich, fudgy brownies with a dreamy marshmallow topping. This makes a 9×13-inch pan—perfect for sharing (or not).
Ingredients
- 1 cup (2 sticks) unsalted butter
- 1 ½ cups granulated sugar
- ¾ cup packed brown sugar
- 4 large eggs
- 1 tablespoon pure vanilla extract
- 1 cup all-purpose flour
- ¾ cup unsweetened cocoa powder
- ½ teaspoon salt
- ½ teaspoon baking powder
- 1 cup mini marshmallows (plus extra for topping)
- 1 ½ cups mini marshmallows (for topping)
Instructions
- Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan or line it with parchment paper for easy removal.
- In a medium saucepan, melt the butter over low heat. Remove from heat and stir in both sugars until well combined. Let cool slightly.
- Add the eggs one at a time, mixing well after each. Stir in the vanilla.
- In a separate bowl, whisk together the flour, cocoa powder, salt, and baking powder.
- Gradually add the dry ingredients to the wet mixture, stirring just until combined. Fold in 1 cup of mini marshmallows.
- Pour the batter into the prepared pan and spread evenly.
- Bake for 20 minutes. Remove from oven and sprinkle the remaining 1 ½ cups of marshmallows evenly over the top.
- Return to the oven and bake for another 5–7 minutes, or until the marshmallows are puffed and lightly golden.
- Optional: Use a kitchen torch or broiler to toast the marshmallows for 1–2 minutes.
- Let cool completely before cutting into squares. Serve at room temperature or slightly warmed.
Creative Twists and Add-Ins
Once you’ve mastered the classic version, it’s time to get creative. Brownies with marshmallows are incredibly versatile—here are some fun ways to mix it up.
Add Chocolate Chips or Chunks
Fold in a cup of semi-sweet or dark chocolate chips along with the marshmallows. The double chocolate effect is rich, decadent, and totally irresistible.
Sprinkle in Some Nuts
Toasted walnuts, pecans, or almonds add a satisfying crunch and nutty depth. Chop them finely so they blend well with the soft texture.
Try a Salted Caramel Swirl
Drizzle store-bought or homemade salted caramel over the batter before adding marshmallows. The sweet-salty combo is next-level delicious.
Go Peanut Butter Crazy
Swirl in ½ cup of peanut butter before baking, or add a layer of peanut butter cups on top of the brownies before adding marshmallows. Hello, Reese’s-inspired brownies!
Make It a S’mores Bar
Crush graham crackers and sprinkle them over the marshmallows before the final bake. You’ll get that full s’more experience in every bite.
Serving and Storing Tips
To keep your brownies with marshmallows fresh and delicious, follow these simple tips.
Best Way to Serve
Serve slightly warm for maximum gooeyness. Pair with a scoop of vanilla ice cream or a dollop of whipped cream for an extra indulgent treat. A glass of cold milk or a cup of coffee makes the perfect companion.
Storing Leftovers
Store cooled brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to 5 days. The marshmallows may soften over time, but the flavor stays rich and delicious.
Freezing for Later
Wrap individual squares in plastic wrap and place in a freezer-safe bag. Freeze for up to 2 months. Thaw at room temperature or reheat in the microwave for 10–15 seconds for a fresh-baked taste.
Reheating Tips
To revive day-old brownies, pop them in the microwave for 10–15 seconds. This brings back the warm, melty texture—especially great if the marshmallows have firmed up.
Why This Dessert Is a Crowd-Pleaser
There’s a reason brownies with marshmallows show up at bake sales, school events, and family gatherings. They’re universally loved—kids adore the sweet, gooey marshmallows, while adults appreciate the rich chocolate base. They’re also incredibly forgiving. Even if you’re not a baking expert, this recipe is hard to mess up. Plus, they look impressive with minimal effort.
Another bonus? They’re highly customizable. Whether you’re catering to dietary needs (try gluten-free flour or dairy-free chocolate) or just want to experiment with flavors, brownies with marshmallows adapt beautifully. And because they’re made in a single pan, cleanup is a breeze.
Final Thoughts: A Dessert Worth Making Again and Again
Decadent brownies with marshmallows aren’t just a treat—they’re an experience. From the first whiff of chocolate baking in the oven to the first bite of warm, melty goodness, every step is pure joy. They remind us of childhood campfires, cozy weekends, and the simple pleasure of something sweet.
Whether you stick to the classic recipe or go all out with mix-ins and toppings, one thing is certain: these brownies will melt in your mouth and steal your heart. So preheat that oven, grab your marshmallows, and get baking. Your taste buds will thank you.
Frequently Asked Questions
Can I use large marshmallows instead of mini?
Yes! Cut large marshmallows into small pieces or quarters before adding them. Mini marshmallows melt more evenly, but large ones work well if chopped finely.
Can I make these brownies ahead of time?
Absolutely. Bake and cool them completely, then store in an airtight container. They’ll stay fresh for up to 5 days in the fridge or 2 months in the freezer.
Why did my marshmallows sink into the brownie?
This usually happens if the batter is too thin or the marshmallows are added too early. Make sure your batter is thick and fudgy, and add marshmallows in the last 5–7 minutes of baking.
Can I make these gluten-free?
Yes! Substitute the all-purpose flour with a 1:1 gluten-free baking blend. The texture will be nearly identical.
Do I have to toast the marshmallows?
No, but toasting adds a delicious caramelized flavor and beautiful color. It’s optional but highly recommended for the full s’more experience.
Can I use dairy-free ingredients?
Definitely. Use dairy-free butter and chocolate to make these brownies vegan-friendly. Just ensure your marshmallows are also dairy-free (most are).