Brownies With Marshmallow Swirl (fudgy + Gooey)

Oh my goodness, get ready to meet your new favourite dessert! I’m so excited to share my absolute best recipe for Brownies With Marshmallow Swirl (fudgy + Gooey). Forget everything you thought you knew about a humble brownie, because we’re taking it to an entirely new level of indulgent bliss. This isn’t just a treat; it’s an experience!

What makes these brownies so incredibly special? It all starts with the foundation: an unbelievably rich, dense, and intensely fudgy chocolate brownie base. I’m talking about a brownie so gooey it practically melts in your mouth with every bite. But we don’t stop there! The magic truly happens when we swirl in generous dollops of sweet, fluffy marshmallow. As it bakes, the marshmallow transforms, creating beautiful, soft, chewy pockets and ribbons of ethereal sweetness throughout the dark chocolate canvas. It’s a textural masterpiece!

You are absolutely going to adore these because they deliver the perfect harmony of deep, dark chocolate intensity and light, sugary marshmallow cloud. It’s a truly unforgettable combination that will satisfy every sweet craving. Each square promises that irresistible fudginess, complemented by the delightful chewiness of the melted marshmallow – it’s pure comfort food at its finest. Get ready to bake a batch of pure happiness that will have everyone begging for the recipe!

Ingredient Notes

Crafting the perfect batch of ‘Brownies With Marshmallow Swirl (fudgy + Gooey)’ starts with understanding the role each ingredient plays. I’ve found that using quality ingredients makes all the difference in achieving that ultimate fudgy texture and delicious gooey swirl.

Unsalted Butter: I always opt for unsalted butter when baking, as it gives me full control over the salt content in my brownies. Melted butter is crucial for that dense, fudgy texture we’re aiming for. If you only have salted butter, you can use it, but reduce the added salt in the recipe by about ¼ teaspoon.
Granulated Sugar: This provides the sweetness and helps create a lovely crackly top crust. I also like to add a touch of brown sugar sometimes for extra moisture and chewiness, but classic granulated sugar works wonderfully here.
Large Eggs: Eggs are essential for binding the ingredients, providing structure, and contributing to the rich, fudgy texture. I always use large eggs, and letting them come to room temperature before mixing helps them emulsify better with the other ingredients, resulting in a smoother batter.
Vanilla Extract: A crucial flavor enhancer! Pure vanilla extract really brings out the rich chocolate notes. Don’t skimp on good quality vanilla.
Unsweetened Cocoa Powder: For a deep, rich chocolate flavor, unsweetened cocoa powder is a must. I prefer Dutch-processed cocoa for its darker color and less acidic, smoother chocolate taste, but natural unsweetened cocoa powder works too and will result in a slightly lighter-colored brownie with a more intense, sharp chocolate flavor.
All-Purpose Flour: You only need a small amount of flour for fudgy brownies. Over-measuring or over-mixing flour will lead to cakey brownies, which isn’t what we want for this recipe. Spoon and level your flour for accuracy!
Salt: A pinch of salt is incredibly important to balance the sweetness and deepen the chocolate flavor. It really makes the chocolate sing!
Semi-Sweet Chocolate Chips (Optional, but recommended): While the cocoa powder provides the primary chocolate flavor, I love adding a handful of semi-sweet chocolate chips (or chopped chocolate) into the batter. They melt into pockets of extra gooey chocolate throughout the brownies, enhancing both flavor and texture.
Mini Marshmallows: These are the star of the swirl! Mini marshmallows are perfect because they melt beautifully and are easy to distribute and swirl. If you only have large marshmallows, you can snip them into smaller pieces with kitchen shears. For a vegan option, look for plant-based marshmallows, which swirl just as nicely.

Step-by-Step Instructions

Get ready to make the most unbelievably fudgy and gooey marshmallow swirl brownies! Follow these steps carefully for success.

Prepare Your Pan: First, preheat your oven to 350°F (175°C). Line an 8×8-inch (or 9×9-inch for slightly thinner brownies) baking pan with parchment paper, leaving an overhang on all sides. This makes it incredibly easy to lift the cooled brownies out of the pan later. Lightly grease the parchment paper for extra insurance.
Melt Butter and Chocolate (if using): In a medium microwave-safe bowl or a saucepan over low heat, melt the unsalted butter. If you’re adding chocolate chips to the batter, add them to the melted butter and stir until smooth. If not, just melt the butter. Let the mixture cool slightly for a few minutes.
Whisk Wet Ingredients: In a large mixing bowl, whisk together the granulated sugar, room-temperature large eggs, and vanilla extract until well combined and slightly pale, about 1-2 minutes.
Combine Wet Mixtures: Pour the slightly cooled melted butter (and chocolate, if used) into the sugar-egg mixture. Whisk until fully incorporated and smooth. The mixture should be glossy.
Combine Dry Ingredients: In a separate small bowl, whisk together the all-purpose flour, unsweetened cocoa powder, and salt. Make sure there are no lumps of cocoa powder.
Combine Wet and Dry: Gradually add the dry ingredients to the wet ingredients. Using a spatula, gently fold until just combined. Be careful not to overmix! Overmixing develops gluten, which will lead to tough, cakey brownies rather than fudgy ones. A few streaks of flour are okay; they will disappear during baking.
First Layer of Batter: Pour about half of the brownie batter into your prepared baking pan and spread it evenly with your spatula.
First Marshmallow Layer: Sprinkle about two-thirds of your mini marshmallows evenly over the first layer of batter.
Second Layer of Batter: Carefully dollop the remaining brownie batter over the marshmallows. It’s okay if it doesn’t cover every marshmallow perfectly; just spread it as best you can without disturbing the layer below too much.
Top with Marshmallows and Swirl: Sprinkle the remaining one-third of mini marshmallows on top of the second batter layer. Now for the fun part! Take a knife or a skewer and gently swirl it through the top layer of batter and marshmallows, creating beautiful marble patterns. Don’t overdo it; a few confident swirls are all you need.
Bake: Transfer the pan to your preheated oven. Bake for 25-30 minutes. You want the edges to be set, but the center should still look a bit soft and slightly jiggly. A toothpick inserted into the center should come out with moist crumbs, not wet batter (but definitely not clean!). This is key for fudgy brownies. The marshmallows will puff up and get slightly golden.
Cool Completely: This is arguably the most important step for fudgy brownies with a clean cut. Remove the pan from the oven and let the brownies cool completely in the pan on a wire rack. This can take 2-3 hours, or you can even chill them in the refrigerator for an hour once they’ve cooled to room temperature. The marshmallows will set as they cool.
Slice and Serve: Once completely cool, use the parchment paper overhang to lift the brownies out of the pan. Place them on a cutting board and slice into squares. Enjoy your perfectly fudgy and gooey marshmallow swirl brownies!

Tips & Suggestions

Achieving the perfect ‘Brownies With Marshmallow Swirl (fudgy + Gooey)’ every time requires a few insider tricks. Here are my top tips to ensure your brownies are nothing short of spectacular:

Do NOT Overbake! This is the golden rule for fudgy brownies. If you overbake them, they will turn cakey and dry. I always err on the side of slightly underbaked. The edges should be set, but the center should still look a little moist and perhaps slightly jiggly when you gently shake the pan. Remember, they continue to cook a little as they cool.
Cool Completely for Fudginess: I cannot stress this enough. For truly fudgy brownies that hold their shape and cut cleanly, they must cool completely. The marshmallow swirl needs time to set, and the brownie itself becomes denser and fudgier as it cools. Patience is a virtue here; resisting the urge to cut into them too early is the hardest part!
Line Your Pan with Parchment Paper: This simple step makes removing the brownies from the pan effortless. Leave an overhang on two sides to create “handles” for easy lifting. A little cooking spray on the parchment helps too.
Use Quality Ingredients: Good quality cocoa powder and butter truly make a difference in the depth of flavor of your brownies. Since there are relatively few ingredients, each one counts.
Room Temperature Eggs: I always make sure my eggs are at room temperature. They incorporate more easily and create a smoother, more emulsified batter, which contributes to a better texture.
For Clean Cuts: Once your brownies are completely cooled (even better if chilled for 30 minutes in the fridge), use a large, sharp knife. For the neatest slices, wipe the knife clean with a damp cloth after each cut, or run it under hot water and dry it quickly before making the next cut.
Don’t Over-Swirl the Marshmallows: When adding the marshmallow swirl, a few gentle passes with your knife or skewer are enough. Over-swirling can cause the marshmallows to disappear too much into the batter, losing that distinct swirled effect. You want distinct ribbons of marshmallow goodness!
Experiment with Toppings (Optional): While perfect on their own, a sprinkle of flaky sea salt after baking really enhances the chocolate flavor. You could also drizzle a little melted chocolate on top once cooled for an extra touch.

Storage

You’ve put in the effort to make these amazing ‘Brownies With Marshmallow Swirl (fudgy + Gooey)’, so let’s make sure they stay fresh and delicious for as long as possible!

Room Temperature: Once your brownies are completely cooled and cut, I recommend storing them in an airtight container at room temperature. They will remain wonderfully fudgy and gooey for 3 to 4 days. Keep them away from direct sunlight or heat to maintain their texture.
Refrigerated: If you prefer your brownies a little firmer, or want to extend their shelf life, you can store them in an airtight container in the refrigerator for up to a week. The cold will make them a bit denser and chewier, which some people absolutely love! You can always let them come to room temperature for 15-20 minutes before serving, or even warm them gently.
Freezing: These brownies freeze beautifully! To freeze, first make sure they are completely cooled. Then, cut them into individual squares. Wrap each brownie tightly in plastic wrap, and then place the wrapped brownies in a freezer-safe zip-top bag or an airtight container. They can be stored in the freezer for up to 2 to 3 months.
Thawing Frozen Brownies: To enjoy frozen brownies, simply remove them from the freezer and let them thaw at room temperature for an hour or two.
Reheating for Extra Gooeyness: If you want to bring back that ultimate gooey factor, especially with the marshmallow swirl, place an individual brownie in the microwave for 10-15 seconds. Be careful not to overheat, or the marshmallows might melt too much and become overly sticky. A brief warm-up is all it takes to bring out that fresh-baked gooeyness!

Final Thoughts

And there you have it – my ultimate recipe for a dessert that truly transcends the ordinary! These Brownies With Marshmallow Swirl (fudgy + Gooey) are more than just a sweet treat; they’re a symphony of textures and flavors that I know you’re going to adore. The deep, rich chocolate fudginess, perfectly balanced by that irresistibly gooey, sweet marshmallow swirl, creates a magical combination in every single bite. It’s an experience that’s comforting, indulgent, and absolutely unforgettable. Trust me on this one: once you taste the pure bliss of these Brownies With Marshmallow Swirl (fudgy + Gooey), you’ll understand why I can’t stop raving about them. Go ahead, bake a batch and prepare to fall in love!

Best Fudgy, Gooey Marshmallow Swirl Brownies Recipe

Author: shareylady
Total Time: 45 minutes
Yield: 16 servings 1x

Print Recipe

Description

Indulge in the ultimate dessert experience with these fudgy and gooey brownies swirled with sweet marshmallow. Each bite promises rich chocolate flavor and delightful chewiness that will leave you craving more!

Ingredients

Scale

1/2 cup Unsalted Butter, melted
1 cup Granulated Sugar
2 Large Eggs, room temperature
1 teaspoon Vanilla Extract
1/3 cup Unsweetened Cocoa Powder
1/2 cup All-Purpose Flour
1/4 teaspoon Salt
1/2 cup Semi-Sweet Chocolate Chips (Optional, but recommended)
1 1/2 cups Mini Marshmallows

Instructions

Preheat your oven to 350°F (175°C). Line an 8×8-inch (or 9×9-inch for slightly thinner brownies) baking pan with parchment paper, leaving an overhang on all sides. Lightly grease the parchment paper.
In a medium microwave-safe bowl or a saucepan over low heat, melt the unsalted butter. If you're adding chocolate chips to the batter, add them to the melted butter and stir until smooth. Let the mixture cool slightly for a few minutes.
In a large mixing bowl, whisk together the granulated sugar, room-temperature large eggs, and vanilla extract until well combined and slightly pale, about 1-2 minutes.
Pour the slightly cooled melted butter (and chocolate, if used) into the sugar-egg mixture. Whisk until fully incorporated and smooth.
In a separate small bowl, whisk together the all-purpose flour, unsweetened cocoa powder, and salt. Make sure there are no lumps of cocoa powder.
Gradually add the dry ingredients to the wet ingredients. Using a spatula, gently fold until just combined. Be careful not to overmix!
Pour about half of the brownie batter into your prepared baking pan and spread it evenly with your spatula.
Sprinkle about two-thirds of your mini marshmallows evenly over the first layer of batter.
Carefully dollop the remaining brownie batter over the marshmallows. Spread it as best you can without disturbing the layer below too much.
Sprinkle the remaining one-third of mini marshmallows on top of the second batter layer. Take a knife or a skewer and gently swirl it through the top layer of batter and marshmallows, creating marble patterns.
Transfer the pan to your preheated oven. Bake for 25-30 minutes. The edges should be set, but the center should still look a bit soft and slightly jiggly.
Remove the pan from the oven and let the brownies cool completely in the pan on a wire rack. This can take 2-3 hours, or you can chill them in the refrigerator for an hour.
Once completely cool, use the parchment paper overhang to lift the brownies out of the pan. Place them on a cutting board and slice into squares.

Prep Time: 15 mins
Cook Time: 30 mins
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 square
Calories: 200
Sugar: 18 g
Sodium: 150 mg
Fat: 10 g
Saturated Fat: 6 g
Unsaturated Fat: 4 g
Trans Fat: 0 g
Carbohydrates: 25 g
Fiber: 1 g
Protein: 2 g
Cholesterol: 40 mg

Keywords: Do NOT overbake! For truly fudgy brownies, they must cool completely. Use quality ingredients for the best flavor, and ensure your eggs are at room temperature for a smoother batter.