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If you’re craving a dessert that’s rich, decadent, and a little over-the-top, this marshmallow brownie recipe is for you. Imagine fudgy brownies topped with a gooey layer of marshmallows and finished with creamy chocolate frosting. The result? A crowd-pleasing, nostalgic dessert that tastes like your favorite childhood treats upgraded into something even better. Whether you’re baking for a birthday party, a holiday gathering, or to enjoy with a glass of milk, these brownies are a guaranteed hit. They’re easy to make, use simple ingredients like cocoa powder, flour, and unsalted butter, and deliver the best results every time.
These browies are everything fudgy marshmallow brownies should be: gooey chocolate brownies topped with marshmallow fluff-like softness. You might also refer to them as brownies with marshmallow topping or chocolate marshmallow bars. For Rocky Road brownie lovers, this recipe hits all the same notes with gooey marshmallow brownies layered under creamy chocolate frosting. They’re homemade marshmallow brownies with rich chocolate brownie flavor, not to mention an easy marshmallow brownie recipe anyone can follow.
The Chemistry of Marshmallow Brownies
The magic of marshmallow brownies lies in the perfect balance of texture. Butter, sugar, eggs, and cocoa powder form the foundation of the brownie batter, resulting in moist crumbs and a deep, rich chocolate flavor. The marshmallows, when added in an even layer on top of the brownies, are baked for just a few minutes, partially melt, and create a gooey marshmallow layer without disappearing into the brownie base. Frosting, whisked from melted butter, cocoa milk, and powdered sugar, sets into a creamy chocolate frosting that contrasts beautifully with the sticky marshmallows. Timing is everything – just a few seconds too long in the oven can turn marshmallows from gooey to burned, so watch them closely.
Recipe Troubleshooting
A frequent challenge is ending up with brownies that are too dry. This usually comes from overbaking, so check for moist crumbs with a toothpick rather than waiting for a clean insert.
Another issue is marshmallows that melt too much or burn; to avoid this, only bake them for 3-4 minutes at most.
If the marshmallows melted into a sticky mess, this happens if they’re baked too long. Keep them in for just 3 minutes until puffed.
Sometimes the frosting turns grainy or too thin. Grainy frosting often indicates that the powdered sugar wasn’t mixed thoroughly enough in the medium bowl, while thin frosting may result from using too much milk.
Another problem is that the marshmallows do not stick well to the brownies. If the brownies cool too long before adding marshmallows, they won’t adhere, so work quickly.
Cutting clean slices can also be tricky when gooey marshmallows and frosting stick to the knife. The easiest way is to chill brownies slightly and grease the knife before slicing.
Cutting can also be messy. Use parchment paper to lift brownies from the pan, chill slightly, and cut with a buttered knife for cleaner squares.
Frosting separating or refusing to spread evenly usually happens when it is poured over overly hot marshmallows; let them rest for a minute before frosting.
Some bakers find the combination too sweet; balancing it with dark chocolate or adding crushed graham crackers or chopped nuts on top helps create a good contrast.
Should I toast the marshmallows before frosting? No need, they’ll toast lightly in the oven during the last few minutes.
How do I keep the marshmallows from melting into the brownie? Bake them only briefly so they puff but don’t liquefy.
Can I use large marshmallows instead of the mini ones? Yes, just cut them in half for a more even layer.
How do I make the frosting thicker? Add more powdered sugar until it spreads smoothly.
Should I wait for the brownies to cool before frosting? Not completely, let the marshmallow layer rest for a few minutes, then pour frosting while still slightly warm for best results.
If the frosting was too runny and soaked into the marshmallows, that’s usually due to pouring it over too-hot marshmallows or using too much liquid. Let the marshmallows rest before adding the frosting, and whisk until smooth.
Can I use a boxed brownie mix instead of making them from scratch? Absolutely! This recipe works with your favorite brownie recipe or a box mix.
If the brownies are too cakey, reduce the flour slightly to achieve fudgy brownies, and avoid overmixing the wet batter.
Serving Suggestions
These brownies adapt beautifully to seasons. Halloween marshmallow brownies are fun with candy eyes or orange sprinkles—holiday brownie bars topped with red and green candies for a festive Christmas treat. In summer, these become campfire brownies with a sprinkle of graham crackers for a s’more brownie twist. Back-to-school dessert ideas often include these as lunchbox favorites, while winter baking recipes and Thanksgiving dessert squares make them perfect for cozy gatherings. They’re also excellent potluck dessert bars or bake sale brownie recipes. And, of course, marshmallow brownies for kids are always trending thanks to their gooey marshmallow and fun toppings.
Serve slightly chilled for firmer frosting and cleaner cuts. For a dramatic presentation, dust the top layer with cocoa powder or drizzle melted chocolate over it. Add texture with crushed graham crackers, chopped nuts, and even semisweet chocolate chips sprinkled across the top of the marshmallow layer.
Pairing ideas include serving with a glass of milk to balance sweetness or adding a scoop of vanilla ice cream for a brownie sundae-style dessert. If doing the sundae option, don’t forget the hot fudge, caramel sauce, and fresh whipped cream.
Similar & Related Recipes
This recipe is a regular part of my brownie board, along with mint brownies and my basic brownies. If you want an extra decadent dessert, pair it with my frozen hot chocolate, mint Oreo ice cream pie, or top it with my very simple chocolate ganache.
Storage Tips
Store brownies in an airtight container at room temperature for 4 to 5 days. For the best brownies, layer parchment paper between them to prevent sticking. Wrap the container in plastic wrap for extra freshness.
Freezer– Wrap individual squares tightly in plastic wrap, then store in an airtight container or freezer bag. They’ll keep for up to 2 months. To thaw, leave them at room temperature for a few hours or microwave in second intervals.
Making Ahead– You can bake the brownies a day ahead, cool, and store in an airtight container before adding marshmallow and frosting the next day. This keeps the marshmallow layer gooey and fresh. Frosted brownies can also be chilled overnight for easier cutting.
Recommended Products
Easy Marshmallow Brownies with Rich Frosting
These marshmallow brownies are the only thing you need when you’re craving a dessert that’s fudgy, gooey, and over-the-top delicious. With their rich chocolate brownie base, gooey marshmallow layer, and creamy chocolate frosting, they’re the best brownies for any gathering. They cut into individual squares beautifully, taste incredible with vanilla ice cream, and make perfect holiday or potluck treats. Whether you’re a fan of Rocky Road brownies, s’mores brownies, or just gooey chocolate brownies in general, this marshmallow brownie recipe belongs at the top of your favorite brownie recipe list. Bake them once, and they’ll become one of your. Most delicious recipes to share!
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The Best Marshmallow Brownies You’ll Ever Make
Ingredients
Brownies
- 1 cup unsalted butter
- 2 cups granulated sugar
- 4 eggs
- 2 tsp vanilla extract
- 3/4 cup cocoa powder
- 1 1/2 cup all-purpose flour
- 2 cups mini marshmallow
Frosting
- 1/4 cup unsalted butter *melted
- 1/3 cup milk
- 1/3 cup cocoa powder
- 1 tsp vanilla extract
- 2 cups powdered sugar
Instructions
- Preheat oven to 350 degrees
- In a standing mixer combine butter & sugar. Beat until lighter in color and fluffy in texture (about 2 minutes)
- Stir in eggs& vanilla extract
- Add cocoa powder & flour, stir until combined
- Pour batter into 9×13 greased pan
- Bake for 27 minutes
- Pour marshmallows on top and bake for additional 3 minutes
- Whisk all the frosting ingredients together in a bowl with a whisk. Pour over the top of your brownies and let completely cool.
Notes
Nutrition
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