
These Marshmallow Brownies deliver an extraordinary twist on classic brownies with swirls of fluffy marshmallow fluff throughout the rich, fudgy chocolate base. Each bite offers the perfect balance of dense, chocolate-packed brownie studded with melty chocolate chips and pockets of sweet, gooey marshmallow - creating an irresistible treat that's like a s'more in brownie form.
I discovered this recipe when looking for a way to elevate my standard brownies for a special occasion. Now they're requested for every gathering!
Essential Ingredients and Selection Tips
- Cocoa Powder: Dutch-process provides a deeper, richer chocolate flavor
- Eggs: The extra egg yolk is crucial for that perfect fudgy texture
- Chocolate Chips: Semi-sweet or dark work best to balance the sweetness
- Marshmallow Fluff: Creates gooey pockets throughout the brownies
- Cornstarch: The secret ingredient for ultra-fudgy texture

Detailed Cooking Instructions
- Egg Beating:
- The full 5 minutes of beating creates the classic crackly top
- Butter Temperature:
- Let melted butter cool slightly before adding
- Flour Incorporation:
- Mix just until combined to prevent tough brownies
- Marshmallow Technique:
- Drop dollops on top and swirl with a knife
- Baking Precision:
- Look for set edges but slightly underdone center
- Cooling Strategy:
- Allow to cool completely for clean cutting
- Cutting Method:
- Use a warm, clean knife between each slice
My friend who runs a bakery taught me that the secret to perfect brownies is patience during beating - those full 5 minutes of beating eggs and sugar creates that enviable crackly top.
Storage Solutions
These brownies stay fresh at room temperature for up to 5 days in an airtight container. For a special treat, warm individual squares in the microwave for 10-15 seconds and top with vanilla ice cream.
After making these countless times, I've learned they're more than just a dessert - they're a conversation starter and mood-lifter. The combination of fudgy chocolate and fluffy marshmallow creates a treat that brings back childhood memories while satisfying grown-up chocolate cravings.
Perfect Texture Guide
The hallmark of these brownies is achieving that ideal balance between fudgy density and marshmallow lightness. For the fudgiest texture, remember that slightly underdone is better than overdone - look for edges that are set but a center that's still slightly soft. The toothpick test should show moist crumbs rather than wet batter or come out completely clean. As they cool, the texture will continue to develop into that perfect fudgy consistency.
Creative Serving Suggestions
While these brownies are spectacular on their own, they reach new heights when served warm with a scoop of vanilla ice cream. The contrast between the warm, gooey brownie and cold, creamy ice cream creates a dessert experience that's hard to beat. For special occasions, try drizzling with warm chocolate sauce or caramel, or create a brownie sundae bar with various toppings.

Troubleshooting Common Issues
If your brownies sink in the middle, they likely needed a few more minutes in the oven. For marshmallow that disappears into the brownies, try swirling less deeply or adding an additional layer of fluff on top during the last five minutes of baking. If your brownies are too cakey rather than fudgy, you may have overmeasured the flour - remember to spoon and level, never scoop directly with the measuring cup.
Seasonal Adaptations
These versatile brownies can be adapted throughout the year. During winter holidays, add a drop of peppermint extract to the batter and sprinkle with crushed candy canes. For summer, top with fresh berries after baking. In fall, try adding a teaspoon of cinnamon to the batter and serving with caramel sauce.
After years of making these brownies, I've found they're perfect for creating special moments. Whether it's packing one in a lunch as a surprise treat, serving them warm at the end of a dinner party, or simply enjoying one with a cup of coffee on a quiet afternoon, these marshmallow brownies have a way of making ordinary moments feel celebratory.
What makes them truly special is how they combine nostalgic flavors in a sophisticated package - they're simultaneously comforting and exciting, familiar yet surprising. Each bite offers different proportions of fudgy brownie and sweet marshmallow, creating a dessert experience that keeps you coming back for 'just one more small piece' until half the pan has mysteriously disappeared!
Recipe Tips & Questions
- → Can I use regular cocoa powder instead of Dutch process?
- Yes, but Dutch process creates a richer, darker chocolate flavor. With regular cocoa, the brownies may be slightly less fudgy and more cake-like.
- → Why do I need to beat the eggs and sugar for 5 minutes?
- This creates the characteristic shiny, crackly top on brownies. Don't skip this step for the best texture and appearance.
- → Can I use homemade marshmallow fluff?
- Absolutely! Homemade marshmallow fluff works perfectly in this recipe if you prefer to make your own.
- → How do I know when the brownies are done?
- A toothpick inserted should come out with a few moist crumbs but not wet batter. For fudgier brownies, err on the side of slightly underbaking.
- → Can I add nuts to this recipe?
- Yes, add 1/2 to 1 cup of chopped walnuts or pecans to the batter along with the chocolate chips if desired.