Marshmallow Brownies
These Marshmallow Brownies are a delightful treat that combines the rich flavors of chocolate with the lightness of marshmallow fluff. Perfect for birthdays, potlucks, or just a cozy night in, these brownies stand out with their fudgy texture and gooey topping. Whether you’re a chocolate lover or just looking to impress guests, this recipe is sure to be a hit!
Why You’ll Love This Recipe
- Decadent Flavor: The combination of chocolate and marshmallow creates an irresistible taste that will satisfy any sweet tooth.
- Easy to Make: With simple ingredients and straightforward steps, anyone can whip up these brownies in no time.
- Perfect for Sharing: Cut them into squares for parties or gatherings; they’re great for sharing with friends and family.
- Versatile Treat: Enjoy them as-is, or add your favorite toppings like nuts or extra chocolate chips for a personalized touch.
- Fudgy Texture: These brownies turn out incredibly moist and chewy, making them a perfect dessert after any meal.
Tools and Preparation
Before diving into baking your delicious Marshmallow Brownies, gather the essential tools to make the process smooth and enjoyable.
Essential Tools and Equipment
- Stand mixer or hand mixer
- 9×9-inch baking pan
- Parchment paper
- Mixing bowls
- Rubber spatula
- Whisk
- Measuring cups and spoons
Importance of Each Tool
- Stand mixer or hand mixer: Ensures that your batter is mixed thoroughly without much effort on your part.
- Baking pan: A good quality pan helps in even cooking, avoiding burnt edges while keeping the center perfectly soft.
- Rubber spatula: Ideal for folding in delicate ingredients like chocolate chips without overmixing the batter.
Ingredients
For these scrumptious marshmallow brownies, you will need the following ingredients:
- 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
- 1 cup Marshmallow creme
How to Make Marshmallow Brownies
Step 1: Preheat the Oven
Preheat your oven to 325°F. Spray a 9×9-inch baking pan with nonstick spray. Line the bottom and two sides of the pan with parchment paper, then spray again.
Step 2: Prepare Dry Ingredients
In a medium bowl, sift together the flour, cocoa powder, cornstarch, and salt. Set this mixture aside.
Step 3: Mix Wet Ingredients
Using a mixer with a whisk attachment, beat together the sugar, eggs, and egg yolk on high speed for about five minutes until it becomes pale in color. While mixing, melt the butter in the microwave and allow it to cool slightly.
Step 4: Combine Wet and Dry Ingredients
Add oil, melted butter, and vanilla extract into the egg mixture. Mix on low until thoroughly combined. Gradually add the dry ingredients until just combined. Gently fold in the chocolate chips using a rubber spatula.
Step 5: Add Marshmallow Fluff
Pour the brownie batter into your prepared baking pan. Melt the marshmallow fluff in the microwave for about 20–30 seconds until it’s easier to work with. Use a teaspoon to dollop marshmallow fluff on top of brownie batter. Lightly swirl it using a butter knife.
Step 6: Bake
Bake in your preheated oven for about 45–55 minutes. Check for doneness by inserting a toothpick; it should come out slightly wet but not with too much batter clinging to it. If needed, bake an additional five minutes.
Step 7: Cool & Serve
Allow your brownies to cool completely on a cooling rack before cutting them into squares and serving. Enjoy!
How to Serve Marshmallow Brownies
Serving your marshmallow brownies can elevate the experience and make them even more enjoyable. Here are some creative suggestions to enhance your dessert presentation.
With Ice Cream
- Vanilla Ice Cream: A classic pairing that complements the fudgy texture of the brownies.
- Mint Chocolate Chip: Adds a refreshing contrast to the rich chocolate flavor.
- Caramel Swirl: Drizzle caramel sauce on top for an indulgent touch.
As a Sundae
- Brownie Sundae: Layer warm marshmallow brownies with ice cream, hot fudge, and whipped cream for a decadent treat.
- Fruit Topper: Add fresh berries or banana slices to balance the sweetness.
With Drinks
- Coffee: A strong cup of coffee enhances the chocolate flavors in the brownies.
- Milkshake: Blend your favorite ice cream with milk for a creamy shake alongside your brownies.
As Party Favors
- Mini Brownie Bites: Cut brownies into small squares and serve them at events for easy snacking.
- Gift Boxes: Package individual brownies in decorative boxes as sweet treats for guests.

How to Perfect Marshmallow Brownies
To achieve the best marshmallow brownies, follow these expert tips. Each step plays a crucial role in enhancing flavor and texture.
- Use Room Temperature Ingredients: Ensure eggs and butter are at room temperature for better mixing and texture.
- Don’t Overmix: Mix just until combined to keep your brownies fudgy and moist.
- Check Baking Time Carefully: Start checking them at 45 minutes; every oven is different, so avoid overbaking.
- Swirl Lightly: When adding marshmallow fluff, swirl gently to create beautiful marbling without fully incorporating it.
- Cool Completely Before Cutting: Let the brownies cool completely on a rack before slicing to maintain their shape and prevent crumbling.
Best Side Dishes for Marshmallow Brownies
Pairing side dishes with your marshmallow brownies can create a well-rounded dessert experience. Here are some delightful options to consider:
- Fresh Strawberries: The tartness of strawberries balances out the sweetness of the brownies beautifully.
- Chocolate Sauce: Drizzle chocolate sauce over brownies for an extra layer of decadence.
- Whipped Cream: Serve with a dollop of whipped cream to add lightness and creaminess.
- Nuts: Chopped walnuts or pecans provide a nice crunch that contrasts with the soft marshmallow brownies.
- Fruits Salad: A side of mixed fruits adds freshness and complements the richness of the dessert.
- Coffee or Espresso: The bitterness of coffee pairs perfectly with sweet desserts like marshmallow brownies.
Common Mistakes to Avoid
Baking marshmallow brownies can be a delightful experience, but there are some common pitfalls to watch out for.
- Incorrect Oven Temperature: Ensure your oven is preheated properly. An incorrect temperature can lead to undercooked or overcooked brownies.
- Skipping the Parchment Paper: Not lining your baking pan with parchment paper can make it hard to remove the brownies later. Always use parchment for easy removal.
- Overmixing the Batter: Mixing the batter too much can result in tough brownies. Mix just until combined for that fudgy texture.
- Not Measuring Ingredients Accurately: Use precise measurements for sugar, flour, and cocoa. Too much of any ingredient can ruin the balance.
- Underbaking the Brownies: It’s tempting to pull them out early, but slightly wet toothpicks mean they need more time. Keep an eye on them as they bake.

Storage & Reheating Instructions
Refrigerator Storage
- Store marshmallow brownies in an airtight container.
- They will last up to 5 days in the refrigerator.
Freezing Marshmallow Brownies
- Place cooled brownies in a freezer-safe container.
- You can freeze them for up to 3 months.
Reheating Marshmallow Brownies
- Oven: Preheat to 350°F, cover with foil, and heat for about 10-15 minutes.
- Microwave: Heat individual pieces on medium power for 10-15 seconds until warm.
- Stovetop: Warm in a skillet over low heat, covered, for about 5 minutes.
Frequently Asked Questions
Here are some common questions about marshmallow brownies.
What makes marshmallow brownies so fudgy?
Marshmallow brownies are fudgy due to the combination of melted butter, chocolate chips, and the right ratio of flour and cocoa powder, which creates a rich texture.
Can I use different types of chocolate chips?
Yes! You can substitute semi-sweet chocolate chips with dark chocolate or even white chocolate chips for a different flavor profile in your marshmallow brownies.
How do I customize marshmallow brownies?
You can add nuts, caramel swirls, or different flavors of extracts to personalize your marshmallow brownies, making them unique and delicious.
What should I serve with marshmallow brownies?
These brownies pair well with vanilla ice cream or whipped cream for an indulgent dessert experience.
Final Thoughts
These marshmallow brownies are a perfect treat for any occasion. Their rich chocolate flavor combined with fluffy marshmallows creates a delightful dessert that everyone will love. Feel free to customize them with your favorite mix-ins or toppings!

Marshmallow Brownies
- Total Time: 1 hour 5 minutes
- Yield: Approximately 16 servings 1x
Description
Indulge in these irresistible Marshmallow Brownies, a heavenly combination of rich chocolate and fluffy marshmallow crème. With their fudgy texture and gooey topping, these treats are perfect for any occasion—be it birthdays, potlucks, or a cozy night at home. Easy to make with simple ingredients, they offer a delightful dessert experience that’s sure to impress your family and friends. Customize them with your favorite toppings or enjoy them as is; each bite delivers a decadently sweet flavor that will satisfy even the most discerning sweet tooth.
Ingredients
- 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
- 1 1/2 TBSP cornstarch
- 1/2 tsp salt
- 1 cup semi-sweet chocolate chips
- 1 cup marshmallow crème
Instructions
- Preheat your oven to 325°F. Spray a 9×9-inch baking pan with nonstick spray. Line the bottom and two sides of the pan with parchment paper, then spray again.
- In a medium bowl, sift together the flour, cocoa powder, cornstarch, and salt. Set this mixture aside.
- Using a mixer with a whisk attachment, beat together the sugar, eggs, and egg yolk on high speed for about five minutes until it becomes pale in color. While mixing, melt the butter in the microwave and allow it to cool slightly.
- Add oil, melted butter, and vanilla extract into the egg mixture. Mix on low until thoroughly combined. Gradually add the dry ingredients until just combined. Gently fold in the chocolate chips using a rubber spatula.
- Pour the brownie batter into your prepared baking pan. Melt the marshmallow fluff in the microwave for about 20–30 seconds until it’s easier to work with. Use a teaspoon to dollop marshmallow fluff on top of brownie batter. Lightly swirl it using a butter knife.
- Bake in your preheated oven for about 45–55 minutes. Check for doneness by inserting a toothpick; it should come out slightly wet but not with too much batter clinging to it. If needed, bake an additional five minutes.
- Allow your brownies to cool completely on a cooling rack before cutting them into squares and serving.
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 square (75g)
- Calories: 290
- Sugar: 29g
- Sodium: 120mg
- Fat: 14g
- Saturated Fat: 7g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 38g
- Fiber: 2g
- Protein: 3g
- Cholesterol: 70mg