These Marshmallow Brownies are a delightful treat that combines rich, fudgy chocolate brownies with a fluffy marshmallow topping. Perfect for gatherings, celebrations, or just a cozy night in, these brownies will impress everyone with their gooey texture and sweet flavor. The swirl of marshmallow fluff takes them to the next level, making them a standout dessert that is sure to satisfy any chocolate lover’s cravings.

Jump to:
- Why You’ll Love This Recipe
- Tools and Preparation
- Essential Tools and Equipment
- Importance of Each Tool
- Ingredients
- For the Brownie Base
- For the Topping
- How to Make Marshmallow Brownies
- Step 1: Preheat the Oven
- Step 2: Mix Dry Ingredients
- Step 3: Beat Sugar and Eggs
- Step 4: Combine Wet Ingredients
- Step 5: Assemble Brownie Batter
- Step 6: Bake
- Step 7: Cool and Serve
- How to Serve Marshmallow Brownies
- Pair with Ice Cream
- Drizzle with Sauce
- Add Fresh Fruits
- Dust with Powdered Sugar
- How to Perfect Marshmallow Brownies
- Best Side Dishes for Marshmallow Brownies
- Common Mistakes to Avoid
- Storage & Reheating Instructions
- Refrigerator Storage
- Freezing Marshmallow Brownies
- Reheating Marshmallow Brownies
- Frequently Asked Questions
- Can I use other types of chocolate in my marshmallow brownies?
- How do I ensure my marshmallow brownies stay fudgy?
- What can I add to customize my marshmallow brownies?
- How long do marshmallow brownies last at room temperature?
- Final Thoughts
- 📖 Recipe Card
Why You’ll Love This Recipe
- Irresistible Flavor: The combination of chocolate and marshmallow creates a deliciously sweet and satisfying dessert.
- Easy to Make: With simple ingredients and straightforward steps, even novice bakers can successfully whip up these indulgent brownies.
- Versatile Occasion: Whether it’s a birthday party or a weekend treat, these brownies fit perfectly into any occasion.
- Decadently Fudgy: These brownies boast a rich texture that melts in your mouth, making each bite utterly enjoyable.
- Impressive Presentation: The swirls of marshmallow fluff on top add an eye-catching touch that makes them look professionally made.
Tools and Preparation
Before you dive into making these delicious Marshmallow Brownies, gather your tools. Having everything ready will streamline the baking process and ensure perfect results.
Essential Tools and Equipment
- 9X9-inch baking pan
- Mixing bowls
- Whisk mixer
- Rubber spatula
- Parchment paper
- Measuring cups and spoons
Importance of Each Tool
- Baking Pan: A sturdy 9X9-inch pan provides the perfect size for achieving the ideal brownie thickness.
- Mixer: Using a whisk mixer helps incorporate air into the batter, creating a light texture while maintaining fudginess.
- Rubber Spatula: This tool is crucial for folding in ingredients gently without deflating the batter.
Ingredients
These marshmallow brownies are super fudgy chocolate brownie with chocolate chips. It has marshmallow fluff swirled on top.
For the Brownie Base
- 2 cups White granulated sugar
- 3 Large eggs
- 1 Egg yolk
- 1/2 cup Unsalted butter (melted)
- 2 tsp Pure vanilla extract
- 1/2 cup Oil (canola or vegetable)
- 3/4 cup All-purpose flour
- 1 cup Unsweetened cocoa powder (Use Dutch process cocoa powder)
- 1 1/2 TBSP Cornstarch
- 1/2 tsp Salt
- 1 cup Semi-sweet chocolate chips
For the Topping
- 1 cup Marshmallow crème

How to Make Marshmallow Brownies
Step 1: Preheat the Oven
Preheat your oven to 325°F. Prepare a 9X9-inch baking pan by spraying it with nonstick baking spray. Line the bottom and two sides of the pan with parchment paper, then spray again for easy removal later.
Step 2: Mix Dry Ingredients
In a medium bowl, sift together the flour, cocoa powder, and cornstarch. Add in the salt and set this mixture aside for later use.
Step 3: Beat Sugar and Eggs
Using a mixer with a whisk attachment, beat together the sugar, eggs, and egg yolk on high speed for about 5 minutes until it becomes pale in color. While mixing, melt the butter in the microwave and let it cool down.
Step 4: Combine Wet Ingredients
Once mixed, add in the oil, melted butter, and vanilla extract. Mix on low speed until combined. Next, gradually add in your dry ingredients mixture—mix just until combined. Fold in the chocolate chips using a rubber spatula.
Step 5: Assemble Brownie Batter
Pour your brownie batter into the prepared pan. In another bowl or microwave-safe dish, melt the marshmallow fluff for about 20-30 seconds until soft. Use a teaspoon to dollop marshmallow fluff onto your brownie batter. With a butter knife, gently swirl through the batter to create marbling.
Step 6: Bake
Bake for approximately 45-55 minutes. To test for doneness, insert a toothpick; if it comes out slightly wet but not covered in batter, it’s done! If necessary, bake for an additional 5 minutes.
Step 7: Cool and Serve
Once baked to perfection, allow your brownies to cool completely on a cooling rack before cutting them into squares and serving.
Enjoy these delicious Marshmallow Brownies as an unforgettable dessert!
How to Serve Marshmallow Brownies
Marshmallow brownies are a delightful treat that can be served in various ways to enhance their flavor and enjoyment. Here are some creative serving suggestions to make your dessert experience even better.
Pair with Ice Cream
- Vanilla ice cream – The creamy texture of vanilla ice cream complements the fudginess of marshmallow brownies perfectly.
- Chocolate ice cream – For chocolate lovers, pairing these brownies with rich chocolate ice cream adds an indulgent twist.
Drizzle with Sauce
- Chocolate sauce – A warm drizzle of chocolate sauce on top adds extra richness and enhances the brownie experience.
- Caramel sauce – The sweet, buttery flavor of caramel pairs wonderfully with the marshmallow topping.
Add Fresh Fruits
- Strawberries – Fresh strawberries offer a refreshing contrast to the rich flavors of the brownies.
- Bananas – Sliced bananas add natural sweetness and a soft texture that balances the chewy brownie.
Dust with Powdered Sugar
- Simple presentation – A light dusting of powdered sugar provides a beautiful finish, making your marshmallow brownies look even more appealing.
How to Perfect Marshmallow Brownies
To ensure your marshmallow brownies turn out perfectly every time, here are some helpful tips.
- Use high-quality cocoa powder – Choosing premium cocoa powder will intensify the chocolate flavor in your brownies.
- Don’t overmix – Mixing just until combined prevents your brownies from becoming tough and ensures they stay fudgy.
- Check for doneness carefully – Insert a toothpick; slight wetness is ideal to achieve that gooey texture.
- Let them cool completely – Allowing your brownies to cool fully makes cutting easier and helps them set properly.

Best Side Dishes for Marshmallow Brownies
Serving side dishes alongside marshmallow brownies can elevate your dessert table. Here are some delicious options to consider.
- Whipped Cream – Light and airy, whipped cream adds a fluffy contrast to the dense brownie.
- Fruit Salad – A mix of fresh fruits offers a refreshing balance to the rich flavors of the brownies.
- Chocolate Chip Cookies – For an extra treat, serve classic chocolate chip cookies alongside for double chocolate bliss.
- Cheesecake Bites – These small bites bring tangy cream cheese flavor that pairs well with sweet marshmallows.
- Nut Butter Spread – A smear of almond or peanut butter adds protein and a nutty taste that complements chocolate.
- Coffee or Espresso – A cup of coffee enhances the flavors of chocolate and adds warmth to your dessert experience.
Common Mistakes to Avoid
When making marshmallow brownies, it’s easy to make some common mistakes. Here are a few to watch out for:
- Skipping the parchment paper: Lining your baking pan with parchment paper ensures easy removal of the brownies. Without it, they may stick and break apart when you try to take them out.
- Overmixing the batter: Mixing the brownie batter too much can lead to tough brownies. Mix just until combined for that fudgy texture we all love.
- Using the wrong cocoa powder: Not using Dutch process cocoa powder can alter the flavor and texture of your brownies. Always opt for Dutch process for a rich chocolate taste.
- Not checking doneness properly: Pulling your brownies out too early or too late can ruin them. Use a toothpick; it should come out slightly wet but not covered in batter.
- Adding cold ingredients: Using cold eggs or butter can affect how well they incorporate into the batter. Always bring these ingredients to room temperature for better mixing.
Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container for up to 5 days.
- Separate layers with parchment paper to prevent sticking.
Freezing Marshmallow Brownies
- Wrap each brownie individually in plastic wrap.
- Place wrapped brownies in a freezer-safe bag or container for up to 3 months.
Reheating Marshmallow Brownies
- Oven: Preheat to 350°F, place brownies on a baking sheet, and heat for about 10 minutes.
- Microwave: Heat individual brownies on medium power for 15-20 seconds.
- Stovetop: Place a brownie in a skillet over low heat, cover, and warm for about 5 minutes.

Frequently Asked Questions
Can I use other types of chocolate in my marshmallow brownies?
You can definitely experiment with different types of chocolate! Dark chocolate or white chocolate chips can add unique flavors.
How do I ensure my marshmallow brownies stay fudgy?
To keep your marshmallow brownies fudgy, avoid overbaking them. The toothpick should come out slightly wet when testing doneness.
What can I add to customize my marshmallow brownies?
You can add nuts, caramel swirls, or even crushed cookies to enhance the texture and flavor of your marshmallow brownies.
How long do marshmallow brownies last at room temperature?
Marshmallow brownies will stay fresh at room temperature in an airtight container for about 3 days.
Final Thoughts
These marshmallow brownies are not only delicious but also versatile. You can easily customize them with your favorite mix-ins or toppings. Whether you’re enjoying them as a snack or serving them at a party, they are sure to impress. Don’t hesitate to give this recipe a try!
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📖 Recipe Card
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Marshmallow Brownies
- Total Time: 1 hour 10 minutes
- Yield: Makes approximately 16 servings 1x
Description
Indulge in the ultimate dessert experience with these Marshmallow Brownies. This irresistible treat features a rich, fudgy chocolate brownie base topped with a fluffy swirl of marshmallow crème. Perfect for any occasion—from birthday parties to cozy nights at home—these brownies are sure to impress with their gooey texture and delightful sweetness. With simple ingredients and easy-to-follow steps, even novice bakers can create this show-stopping dessert that will satisfy chocolate cravings and leave everyone wanting more.
Ingredients
- 2 cups white granulated sugar
- 3 large eggs
- 1 egg yolk
- ½ cup unsalted butter (melted)
- 2 tsp pure vanilla extract
- ½ cup oil (canola or vegetable)
- ¾ cup all-purpose flour
- 1 cup unsweetened cocoa powder (preferably Dutch process)
- 1½ tbsp cornstarch
- ½ tsp salt
- 1 cup semi-sweet chocolate chips
- 1 cup marshmallow crème (for topping)
Instructions
- Preheat your oven to 325°F and prepare a 9×9-inch baking pan with nonstick spray and parchment paper.
- In a medium bowl, sift together the flour, cocoa powder, cornstarch, and salt; set aside.
- In a large mixing bowl, whisk together sugar, eggs, and egg yolk on high speed for about 5 minutes until pale.
- Slowly incorporate melted butter, oil, and vanilla extract; mix until combined.
- Gradually add the dry ingredient mixture, mixing just until combined. Fold in chocolate chips.
- Pour brownie batter into the prepared pan. Melt marshmallow crème in the microwave for about 20 seconds and dollop it onto the batter. Swirl gently with a knife for marbling.
- Bake for approximately 45-55 minutes or until a toothpick comes out slightly wet but not covered in batter.
- Allow brownies to cool completely before cutting into squares.
- Prep Time: 20 minutes
- Cook Time: 50 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 square (approximately 70g)
- Calories: 300
- Sugar: 30g
- Sodium: 180mg
- Fat: 15g
- Saturated Fat: 8g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 38g
- Fiber: 2g
- Protein: 4g
- Cholesterol: 40mg