Marshmallow Brownies: Gooey, Dreamy Chocolate Bliss

Isla HayesPosted on July 9, 2025

Delicious Marshmallow Brownies

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Hey there, it’s Isla! Last weekend, my spouse Josh and I decided to shake up our usual family dessert routine with something gooey and fun. Our kids, Ben and Zoe, are always up for a sweet treat, and I wanted something quick yet exciting for our busy household.

After rummaging through the pantry, I stumbled on a jar of marshmallow fluff and instantly thought of whipping up some Marshmallow Brownies.

The kitchen turned into a mini chaos zone as Ben helped measure the chocolate chips while Zoe insisted on “taste-testing” the fluff straight from the jar. Josh, my ever-practical partner, kept us on track by prepping the pan.

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Marshmallow Brownies: Gooey, Dreamy Chocolate Bliss


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👨‍🍳 Author: Isla Hayes
🌍 Cuisine: General
🍰 Category: Dessert

Ingredients:

01
2 cups White granulated sugar
02
3 Large eggs
03
1 Egg yplk
04
1/2 cup Unsalted butter (melted)
05
2 tsp Pure vanilla extract
06
1/2 cup Oil (canola or vegetable)
07
3/4 cup All-purpose flour
08
1 cup Unsweetened cocoa powder (Use dutch process cocoa powder)
09
1 1/2 TBSP Cornstarch
10
1/2 tsp Salt
11
1 cup Semi-sweet chocolate chips
12
1 cup Marshmallow creme

Instructions:

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. It will become 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 it 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 1 teaspoon to dollop the marshmallow fluff on top of the brownie batter. Use a butter knife to very light 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.

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Watching the kids’ faces light up as we swirled the fluff into the batter was pure joy.

These brownies baked up fudgy and irresistible, and within minutes of cooling, we were all digging in with sticky fingers and big smiles. For busy families like ours, recipes like this are gold—minimal effort, maximum happiness.

I can’t wait for you to try these Marshmallow Brownies with your loved ones!

Table Of Contents

Delicious Marshmallow BrowniesDelicious Marshmallow Brownies

Why This Dish Is a Must-Try

Looking for a dessert that’s both indulgent and easy to make? These Marshmallow Brownies are the perfect blend of fudgy chocolate and gooey marshmallow fluff. They’re a crowd-pleaser for kids and adults alike, making any occasion a little sweeter.

  • Fudgy Perfection: The rich, dense texture of these brownies paired with melted chocolate chips creates a decadent bite every time.
  • Gooey Marshmallow Magic: Swirled marshmallow fluff adds a fluffy, sticky sweetness that elevates the classic brownie experience.
  • Quick and Simple: With minimal prep and everyday ingredients, this recipe fits perfectly into a busy family schedule.
  • Kid-Friendly Fun: Kids love the sticky, sweet layers, and they can even help with mixing or swirling the fluff.

Ingredients for Marshmallow Brownies

Gathering ingredients for Marshmallow Brownies is a breeze. Most items are pantry staples, ensuring you can whip up this treat anytime a craving hits. Let’s break down what you’ll need for this delightful dessert.

  • 2 cups White granulated sugar
  • 3 Large eggs
  • 1 Egg yplk
  • 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

Let’s Cook It Together: Step-by-Step Marshmallow Brownies

Creating these Marshmallow Brownies is straightforward and fun, even for beginner bakers. Follow these steps to achieve a fudgy, gooey dessert that will have everyone asking for seconds. Let’s get started!

  1. 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.
  2. In a medium bowl, sift the flour, cocoa powder, and cornstarch together. Add in the salt and set aside.
  3. Using a mixer with a whisk attachment, beat the sugar, eggs, and egg yolk on high speed for 5 minutes. It will become pale in color. While that mixes, melt the butter in the microwave and let it cool.
  4. 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 it in.
  5. Pour the brownie batter into the pan. Melt the marshmallow fluff in the microwave for 20-30 seconds and mix. Use a 1 teaspoon to dollop the marshmallow fluff on top of the brownie batter. Use a butter knife to very light swirl the marshmallow fluff.
  6. 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.
  7. Cool on a cooling rack completely before cutting into them and serving.

Isla’s Helpful Hints & Hacks

Want to make baking these brownies even easier? Here are some practical tips to ensure success every time.

  • Measuring Flour: Spoon and level your flour to avoid a cakey texture. Too much compacted flour can ruin the fudgy consistency of your brownies.
  • Cutting Clean Slices: Chill the brownies in the freezer for 10 minutes before cutting. Use a sharp knife and wipe it after each slice for neat edges.
  • Pan Prep: Line your pan with parchment paper and spray with nonstick spray for easy removal after baking. No sticking, no mess!

Switch It Up: Creative Takes on Marshmallow Brownies

Feeling adventurous? These Marshmallow Brownies can be customized with fun twists to suit any taste. Try these variations to add a unique spin to your batch and keep things exciting.

  • Nutty Crunch: Add chopped walnuts or pecans to the batter for a satisfying crunch that contrasts the gooey marshmallow texture. Mix in about ½ cup before baking.
  • Caramel Swirl: Drizzle caramel sauce over the marshmallow fluff before swirling. It adds a rich, buttery layer that pairs beautifully with chocolate.
  • Mint Chocolate: Use mint-flavored chocolate chips or add a drop of peppermint extract to the batter for a refreshing twist on this classic treat.

Perfect Pairings: What to Serve with Marshmallow Brownies

These brownies are delicious on their own, but pairing them with the right sides or drinks can elevate the experience. Here are some ideas to complement the rich flavors.

  • Vanilla Ice Cream: A scoop of creamy vanilla ice cream on top of a warm brownie creates a heavenly hot-and-cold contrast with the gooey marshmallow.
  • Glass of Milk: The classic pairing of cold milk cuts through the sweetness and richness, making each bite even more enjoyable for all ages.
  • Hot Chocolate: Serve with a mug of hot cocoa for an ultimate chocolate lover’s treat, enhancing the dessert’s cozy, comforting vibe.

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Conclusion

Marshmallow Brownies are the ultimate treat for chocolate lovers and busy families alike. With their fudgy base and gooey marshmallow swirl, they bring smiles with every bite. Perfect for any occasion, they’re a dessert you’ll make again and again.

Ready to indulge in this sweet delight? Try baking these brownies today and watch your family light up with joy. Share your experience in the comments below—I’d love to hear how they turned out for you!

Isla’s Final Thought from the Heart

Every bite of these Marshmallow Brownies reminds me of cozy family moments. They’re more than just dessert; they’re a way to connect. I’d love to know how you enjoyed them or any fun twists you added—drop a comment and let’s chat!

Frequently Asked Questions (FAQ)

What happens if you put marshmallows in cake mix?

Adding marshmallows to cake mix can create a gooey, sweet texture, much like in Marshmallow Brownies. As the cake bakes, marshmallows melt partially, forming sticky pockets of sweetness. However, they can also make the batter uneven or overly sticky if not distributed well.

For best results, fold in mini marshmallows near the end of mixing or sprinkle them on top before baking to avoid sinking. Monitor baking time, as they may affect moisture levels.

Is it unhealthy to roast marshmallows over a gas stove?

Roasting marshmallows over a gas stove can be safe if done carefully, though it’s not the healthiest option for treats like Marshmallow Brownies. Gas stoves burn cleaner than wood fires, reducing harmful smoke exposure, but inhaling fumes or burning marshmallows can release carcinogens.

Use a skewer, keep the flame low, and ensure good ventilation. Limit frequency, as roasted marshmallows are high in sugar, and prioritize safer methods like oven-toasting for toppings.

What is the purpose of marshmallows in baking?

Marshmallows in baking, such as in Marshmallow Brownies, add a unique chewy, gooey texture and sweetness. They melt during baking, creating a sticky, caramelized layer or soft pockets within desserts. Marshmallows also contribute moisture, enhancing richness.

They’re often used as toppings or mix-ins to provide contrast to denser batters like brownies. For best results, use mini marshmallows or cut larger ones to ensure even melting and distribution in recipes.

Why can’t you microwave marshmallows?

You can microwave marshmallows, but caution is key, especially for recipes like Marshmallow Brownies. Marshmallows expand rapidly as the air inside heats up, risking a mess or explosion if overheated.

They can also burn easily due to high sugar content. If melting for a topping, use short 10-second bursts, stirring in between, and watch closely. For safety, avoid microwaving whole marshmallows alone; mix with butter or chocolate to control melting.

Does marshmallow fluff melt in the oven?

Yes, marshmallow fluff melts in the oven, making it a fantastic addition to desserts like Marshmallow Brownies. When exposed to heat, it softens and becomes gooey, often forming a sticky, golden layer if baked on top.

It’s ideal for swirling into batters or spreading as a topping. Bake at moderate temperatures (around 350°F) to avoid burning, and watch closely, as it can brown quickly. It adds a delightful, creamy texture to baked goods.

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