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Marshmallow Brownies: Fudgy Swirled Marshmallow Fluff Top – A Rich, Chewy Brownie with Creamy Marshmallow Swirl
Growing up in my mother’s kitchen in Morocco, I learned early that a good dessert can bring people together like a fragrant tagine. In New York’s bustling food scene, I now craft desserts that honor that heritage while adding a Parisian twist. Today’s recipe, Marshmallow Brownies with a Fudgy Swirled Marshmallow Fluff Top, blends both worlds into one irresistible bite.
If you close your eyes, you’ll hear a crackle as the butter melts, the scent of Dutch‑process cocoa permeating the air. The first bite delivers a gooey center, a slight crunch from semi‑sweet chocolate chips, and the sweet, airy marshmallow swirl that melts into the brownie’s rich depth. The final swirl leaves a glossy sheen that invites you to dig deeper for that extra silky taste.
My training in Paris taught me the importance of balancing flavors, and this brownie uses that principle. I’ll reveal my pro tip for a perfect swirl: let the marshmallow fluff sit at room temperature before frosting so it stays fluid and glossy. I’ll also warn you: over-baking can dry these babies, so keep an eye on the timer.
Why This Marshmallow Brownies Recipe Is the Best
First, the Fudgy Swirled Marshmallow Fluff Top gives a decadent moisture that transforms a standard brownie into a decadent sweet treat that feels like a New York baker’s signature dessert. It’s the perfect compromise between a crisp cookie and a soaked cake.
Second, every fold comes from a French patisserie technique where chocolate chips are folded in with a gentle spatula, ensuring their even distribution while preserving the moisture at the center. The result is a silky mouthfeel that you’ll keep reaching for.
Third, the recipe is beginner‑friendly: two-step mixing, simple swirls, and no need for precise measurements. Anyone can follow it, and the brownie will still turn out beautiful, moist, and delicious.
Marshmallow Brownies Ingredients
When I head to the local farmers market in Brooklyn, I pick out the best quality ingredients—fresh butter, Dutch‑process cocoa, and high‑quality chocolate chips. I then bring them back to my tiny kitchen to create flavor that feels both local and luxurious.
Ingredients List
- 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 (use Dutch‑process)
- 1½ Tbsp Cornstarch
- ½ tsp Salt
- 1 cup Semi‑sweet chocolate chips
- 1 cup Marshmallow creme
Ingredient Spotlight
Unsweetened Cocoa Powder – The backbone of the brownie’s deep chocolate flavor. Choose Dutch‑process for a smoother, less acidic taste. Look for a dark brown color. A substitution is chocolate‑flavored cocoa with a bit less bitterness.
Marshmallow Crème – The star of the swirl. It’s sweet, airy, and glossy. If you can’t find it, use a homemade mix of marshmallow fluff and 1 tsp vanilla. Keep it room temperature so it stays pourable.
All‑Purpose Flour – Gives structure to the batter without making it cakey. Replace ¼ cup with almond flour for a gluten‑free spin—be sure to add 1 Tbsp extra cornstarch to keep it sturdy.
Chocolate Chips – Semi‑sweet give a balanced bite. If you want a richer chocolate flavor, swap them for dark chocolate chunks.
| Original Ingredient | Best Substitution | Flavor / Texture Impact |
|---|---|---|
| Unsweetened Cocoa Powder | Chocolate‑flavored cocoa | Slightly sweeter, less bitter. |
| Marshmallow Crème | Homemade marshmallow fluff + vanilla | Same moisture, similar taste. |
| All‑Purpose Flour | Almond flour + extra cornstarch | Gluten‑free, denser crumb. |
| Semi‑sweet Chocolate Chips | Dark chocolate chunks | Richer flavor, less sweet. |
How to Make Marshmallow Brownies — Step‑by‑Step
Let’s get baking! Follow these steps and you’ll end up with silky, fudgy brownies that melt in your mouth.
Step 1: Preheat and Prep
Preheat oven to 325°F and spray a 9×9‑inch pan with non‑stick spray. Line two sides and the bottom with parchment paper, then spray again to ensure no sticking. A buttery pan keeps the brownies from sinking.
💡 Samantha’s Pro Tip: Add a dash of sea salt to the parchment before lining to accentuate the chocolate tones.
Step 2: Sift Dry Ingredients
In a medium bowl, sift together flour, Dutch‑process cocoa, cornstarch, and salt. Sifting removes lumps and gives a fine crumb. Set aside while you whisk wet ingredients.
⚠️ Common Mistake to Avoid: Skipping the sift can lead to a gritty center.
Step 3: Beat Sugar and Eggs
Using a whisk attachment on a stand mixer, beat sugar, eggs, and yolk on high for about 5 minutes until pale. The batter will lighten, indicating the right air incorporation.
💡 Samantha’s Pro Tip: Keep the mixer on a gentle speed after the initial high beat to avoid over‑froth.
Step 4: Combine Wet and Dry
Add melted butter, oil, and vanilla to the sugar‑egg mixture, mixing on low until combined. Gently fold the dry mix into the wet batter until just combined. Pour in chocolate chips and fold in with a spatula.
⚠️ Common Mistake to Avoid: Over‑mixing can cause toughness; blend until smooth.
Step 5: Fold in Chocolate Chips
Use a rubber spatula to fold the semi‑sweet chocolate chips into the batter. Spread evenly for an even chocolate cloud throughout.
💡 Samantha’s Pro Tip: Let chips sit for 2 min while mixing to avoid sinking.
Step 6: Create Marshmallow Swirls
Melt marshmallow fluff for 20‑30 seconds in the microwave, then let cool slightly. Dollop teaspoons of fluff onto the batter and use a butter knife to swirl lightly. Each swirl should stay slightly raised when baked.
⚠️ Common Mistake to Avoid: Using cold fluff causes it to spread flat.
Step 7: Bake and Cool
Bake 45‑55 minutes. Check with a toothpick: if it comes out slightly wet, the brownies are ready, as the core needs to stay fudgy. Let cool on a rack fully before cutting.
💡 Samantha’s Pro Tip: Bake on the lower rack to prevent over‑brown the top.
| Step | Action | Duration | Key Visual Cue |
|---|---|---|---|
| 1 | Preheat & line pan | 45 sec | Parchment adheres smoothly |
| 2 | Sift dry mix | 30 sec | Smooth crumbs visible |
| 3 | Whisk sugar & eggs | 5 min | Pale, airy batter |
| 4 | Combine wet & dry | 2 min | Even batter with no lumps |
| 5 | Fold in chips | 30 sec | Even chocolate dispersion |
| 6 | Add marshmallow swirls | 30 sec | Distinct swirls visible |
| 7 | Bake & cool | 45‑55 min | Toothpick slightly moist |
Serving & Presentation
Cut the brownies into squares and serve them warm with a drizzle of espresso or a scoop of vanilla ice cream for a New York diner vibe. Sprinkle a pinch of sea salt on top to enhance the chocolate’s depth.
For a touch of Mediterranean flair, garnish with crushed pistachios or a dusting of powdered sugar. The combination of sweet marshmallow and salt on top gives a burst of flavor reminiscent of street markets in Marrakesh.
| Pairing Type | Suggestions | Why It Works |
|---|---|---|
| Side Dish | Rich cheese plate, spinach salad | Balanced sweetness with savory. |
| Sauce / Dip | Caramel sauce, chocolate ganache | Enhances chocolate depth. |
| Beverage | Espresso, milkshake, sparkling wine | Cool contrast to sweetness. |
| Garnish | Crushed pistachios, cocoa powder, cinnamon dust | Adds crunch and aroma. |
Make‑Ahead, Storage & Reheating
I love baking these on a Sunday and packing them for a hectic week. The brownies stay moist for a full week when refrigerated and two months frozen.
| Method | Container | Duration | Reheating Tip |
|---|---|---|---|
| Refrigerator | Sealed plastic bag | 7 days | Let sit at room temp 20 min before serving. |
| Freezer | Ice‑box bags | 2 months | Warm in oven 10‑12 min at 350°F. |
| Make‑Ahead | Pre‑portion & freeze individual squares | 3 days | Reheat in toaster oven 3‑4 min. |
When reheating, avoid over‑browning the marshmallow layer by covering loosely with foil. I always wrap the stack with parchment and heat at a gentle 300°F for 5‑7 minutes; the result stays creamy.
Variations & Easy Swaps
| Variation | Key Change | Best For | Difficulty Impact |
|---|---|---|---|
| Caramel Swirl Sweet Twist | Swap marshmallow for caramel sauce swirls. | Kids and caramel lovers. | Easy. |
| Gluten‑Free Delight | Use almond flour + extra cornstarch. | Gluten‑sensitive. | Medium. |
| Lemon Zest Crunch | Add lemon zest & zest‑flavored chips. | Spring/Summer. | Easy. |
Caramel Swirl Sweet Twist
Replace the marshmallow with a thin stream of buttery caramel sauce, swirl to create a gooey ribbon. The caramel’s nutty flavor mirrors a street‑corner treat in New Orleans, lending a warm, buttery richness.
Gluten‑Free Delight
Use ¾ cup almond flour in place of all‑purpose flour and add 2 tbsp cornstarch. The crumb turns denser, yet the chocolate stays decadent. I’ve tested it; the texture feels like a rich cookie rather than a cake.
Lemon Zest Crunch
Add 1 tbsp lemon zest and sprinkle lemon‑flavored chocolate chips. The citrus brightens the chocolate, offering a fresh zing that echoes a sunny day in Brooklyn’s Queens market.
How long does it take to bake marshmallow brownies?
Typically the batter needs about 45–55 minutes at 325°F. The exact time depends on your oven’s calibration and how warm you want the center. I test with a toothpick; when a light glaze comes with a few crumbs, the brownies are ready. If you’re in a hurry, lower the temperature slightly, but avoid underbaking, which leads to a dry crumb.
Can I freeze frozen marshmallow brownies?
Absolutely. Wrap the cooled squares tightly in plastic wrap and then in foil or a freezer bag. Freeze for up to two months. When you’re ready to eat, unwrap and warm in a 300°F preheated oven for 5–7 minutes. The marshmallow layer will soften, giving a fresh, gooey bite.
What’s a good substitute for marshmallow creme?
Marshmallow fluff is quite hard to find in some regions. A simple at‑home replacement is 1 cup of peanut butter and 1‑2 tbsp of honey, whipped until fluffy, or mix 1 cup sugar‑free marshmallow fluff with a splash of vanilla extract. For an extra smooth texture, add a teaspoon of cocoa powder for a chocolate version.
Is it possible to make these brownies gluten‑free?
Yes, swap the all‑purpose flour for a gluten‑free blend (often a 1:1 ratio of almond, oat, and rice flours) and add 1‑2 tbsp of cornstarch to maintain structure. The result will stay fudgy, though the crumb will be slightly denser. I recommend testing a small batch to confirm the texture before full kitchen prep.
Yes, swap the all‑purpose flour for a gluten‑free blend (often a 1:1 ratio of almond, oat, and rice flours) and add 1‑2 tbsp of cornstarch to maintain structure. The result will stay fudgy, though the crumb will be slightly denser. I recommend testing a small batch to confirm the texture before full kitchen prep.
What kind of chocolate chips should I use?
Use semi‑sweet or dark chocolate chips for a balanced flavor. If extra richness is desired, substitute with dark chocolate chips (70% cacao). Avoid white chocolate as it can interfere with the chocolate‑cocoa balance and alter the aroma profile. The chocolate should be evenly dispersed for uniform bites.
Can I make these brownies in a mini muffin tin?
Indeed, you can use a mini muffin tin to get bite‑size squares. Reduce the baking time to about 25–30 minutes at 325°F. Keep the batter level within the cups and watch for the toothpick test. The texture becomes more cake‑like, making them perfect for snack portions.
What’s the best way to keep the brownies moist?
The trick is to monitor the oven closely and not overbake. Store the finished brownies in an airtight container at room temperature for up to three days. If you need them longer, refrigerate in a sealed bag and let them return to room warmth before slicing. The marshmallow layer adds moisture, but proper storage keeps them from drying.
Can I use a different type of oil?
Yes. Canola oil is the recipe’s choice, but you can equally use sunflower or light olive oil. If you prefer a buttery flavor, swap the oil with an equal amount of butter or coconut oil. Just remember that coconut oil will also add a subtle coconut aroma.
What’s the calorie count per brownie?
Based on the nutrition data (336 kcal for 12 servings), each brownie contains approximately 28 kcal. This number is slightly higher if you increase the butter or chips, so consider portion control when serving at parties.
How can I make the marshmallow swirl more pronounced?
The key is room‑temperature marshmallow. Let the fluff sit for at least 15 minutes before you pour it into the batter, and add it in thin ribbons around the top. Rolling a butter knife across the surface at a shallow angle creates a swirly effect that stays visible after baking. For an extra dramatic effect, sprinkle a few crushed almonds over each swirl before baking.
Share Your Version!
What’s your secret ingredient? Try swapping the chocolate chips for sea salt caramel or adding a hint of espresso for depth. Drop a comment below and give this recipe a star rating. I’ll read every note—your feedback helps me grow my kitchen story.
Upload a photo on Instagram or Pinterest and tag @mykitchenstorie so we can celebrate your creation together. If you made a variation, let me know which twist did the best—your feedback is my favorite seasoning.
From my NYC kitchen to yours — I hope this recipe brings as much warmth to your table as it does to mine. — Samantha 🧡
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Marshmallow Brownies
These marshmallow brownies are super fudgy chocolate brownie with chocolate chips. It has marshmallow fluff swirled on top.
Ingredients
- 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
Instructions
- 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.
- In a medium bowl, sift the flour, cocoa powder, and cornstarch together. Add in the salt and set aside.
- 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.
- 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.
- 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.
- 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.
- Cool on a cooling rack completely before cutting into them and serving.
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