Marshmallow Brownies

Featured in Sweet Moments of Joy.

Mix sugar and eggs until pale, combine with melted butter, oil, and vanilla. Add dry ingredients and chocolate chips. Pour into pan, dollop with marshmallow creme, swirl, bake at 325°F for 45-55 minutes.
Barbara Chef
Recipe by Barbara
Updated on Tue, 25 Feb 2025 21:02:26 GMT
A square of chocolate brownie with white frosting and a marshmallow on top. Pin it
A square of chocolate brownie with white frosting and a marshmallow on top. | gracefulflavors.com

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
Two pieces of chocolate cake with white frosting and chocolate drizzle. Pin it
Two pieces of chocolate cake with white frosting and chocolate drizzle. | gracefulflavors.com

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.

A piece of chocolate cake with white frosting and marshmallows on top. Pin it
A piece of chocolate cake with white frosting and marshmallows on top. | gracefulflavors.com

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.

Fudgy Marshmallow Swirl Brownies

Ultra-fudgy chocolate brownies packed with chocolate chips and topped with swirls of marshmallow fluff for the perfect gooey, sweet treat.

Prep Time
15 Minutes
Cook Time
50 Minutes
Total Time
65 Minutes
Recipe by: Barbara

Recipe Type: Irresistible Desserts

Skill Level: Moderate

Style of Cooking: American

Makes: 16 Serves (16 brownies)

Dietary Notes: Vegetarian

What You'll Need

→ Brownie Ingredients

01 2 cups white granulated sugar
02 3 large eggs
03 1 egg yolk
04 ½ cup unsalted butter, melted
05 2 teaspoons pure vanilla extract
06 ½ cup oil (canola or vegetable)
07 ¾ cup all-purpose flour
08 1 cup unsweetened cocoa powder (Dutch process recommended)
09 1 ½ tablespoons cornstarch
10 ½ teaspoon salt
11 1 cup semi-sweet chocolate chips

→ Topping

12 1 cup marshmallow creme

Let's Cook!

Step 01

Preheat the oven to 325°F. Spray a 9X9-inch baking pan with baking nonstick spray. Line the bottom and 2 sides of the pan with parchment paper and spray again

Step 02

In a medium bowl, sift the flour, cocoa powder, and cornstarch together. Add in the salt and set aside

Step 03

Using a mixer with a whisk attachment, beat the sugar, eggs, and egg yolk on high speed for 5 minutes until pale in color. While that mixes, melt the butter in the microwave and let it cool

Step 04

Add the oil, melted butter, and vanilla and mix on low until combined. Add in the dry ingredients and mix on low until just combined. Pour in the chocolate chips and use a rubber spatula to fold them in

Step 05

Pour the brownie batter into the pan. Melt the marshmallow fluff in the microwave for 20-30 seconds and mix. Use a teaspoon to dollop the marshmallow fluff on top of the brownie batter. Use a butter knife to very lightly swirl the marshmallow fluff

Step 06

Bake for 45-55 minutes. It is done baking when you stick in a toothpick, and it is slightly wet. If a lot of batter comes out, then bake for another 5 minutes

Step 07

Cool on a cooling rack completely before cutting into them and serving

Cook's Notes

  1. Use Dutch process cocoa powder for best results
  2. Cool completely before cutting for clean slices
  3. For fudgier brownies, don't overbake

Kitchen Equipment Needed

  • 9X9-inch baking pan
  • Parchment paper
  • Stand mixer with whisk attachment
  • Rubber spatula
  • Cooling rack

Allergy Notes

Always check ingredients carefully for allergens. When in doubt, please consult your healthcare provider.
  • Contains eggs
  • Contains dairy
  • Contains wheat

Nutrition Information (Per Serving)

These values are estimates and should be used as a general guide.
  • Calories: 336
  • Total Fat: 18 g
  • Total Carbohydrate: 46 g
  • Protein: 2 g