5-Ingredient Fudgy Marshmallow Brownies: Gooey Chocolate Bliss

If you're a chocolate lover who craves a gooey, fudgy brownie with a twist, these 5-ingredient fudgy marshmallow brownies are about to become your new obsession. Picture this: a dense, rich chocolate brownie base, a creamy white chocolate layer hidden inside, and a crown of golden, toasted marshmallows that stretch with every bite. And the best part? You only need five simple ingredients—most of which are probably in your pantry right now.

I've made these brownies countless times, and they never fail to impress. Whether it's a weeknight craving or a last-minute dessert for a potluck, these brownies deliver maximum indulgence with minimal effort. The combination of textures—fudgy, creamy, and gooey—is absolutely irresistible. Let's dive into how you can make them at home.

Why You'll Love This Dish

• Only 5 ingredients: No complicated shopping list—just pantry staples and a bag of marshmallows.
• Gooey and fudgy: The brownie base is rich and dense, thanks to a secret technique.
• Surprise inside: A layer of white chocolate melts into the center, adding creamy sweetness.
• Toasted marshmallow topping: Golden, caramelized marshmallows take these over the top.
• Quick to make: One bowl, no mixer required, and ready in under an hour.

Ingredients & Smart Swaps

Here's what you'll need to make these amazing brownies. I've also included some smart swaps in case you're missing something or want to customize.

• 1 cup (2 sticks) unsalted butter, melted – This gives the brownies their fudgy texture. You can use salted butter and reduce the added salt to a pinch.
• 2 cups granulated sugar – Essential for sweetness and that shiny, crackly top. Don't reduce it; the texture depends on it.
• 4 large eggs – Room temperature eggs blend more smoothly. If you're out, you can use 1/4 cup applesauce per egg, but the texture will be slightly cakier.
• 1 teaspoon vanilla extract – Adds depth. You can substitute with 1/2 teaspoon almond extract for a different flavor.
• 1 1/4 cups all-purpose flour – The structure. For a gluten-free version, use a 1:1 gluten-free flour blend.
• 3/4 cup unsweetened cocoa powder – Use Dutch-processed for a deeper color and smoother flavor.
• 1/2 teaspoon salt – Balances sweetness. If using salted butter, omit this.
• 1 cup white chocolate chips or chopped white chocolate – This creates the surprise layer. You can swap with milk chocolate or dark chocolate if you prefer.
• 2 cups mini marshmallows – Mini marshmallows toast evenly. If using large marshmallows, cut them into quarters.

Pro-Tip: For the fudgiest brownies, don't overmix the batter once you add the flour. Stop as soon as you see no dry streaks. Overmixing develops gluten, which makes brownies cakey.

Step-by-Step Cooking Guide

Making these brownies is straightforward, but a few key steps ensure perfect results. Follow along:

1. Preheat and prepare: Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving an overhang on two sides for easy removal. Lightly grease the parchment.
2. Make the brownie batter: In a large microwave-safe bowl, melt the butter in 30-second bursts until just melted (about 1 minute total). Whisk in the sugar until well combined. Add the eggs one at a time, whisking vigorously after each addition until the mixture is glossy and thick. Stir in the vanilla.
3. Add dry ingredients: In a separate bowl, whisk together the flour, cocoa powder, and salt. Add the dry ingredients to the wet mixture and fold gently with a spatula until just combined—do not overmix. The batter will be thick.
4. Create the white chocolate layer: Pour half of the brownie batter into the prepared pan and spread evenly. Sprinkle the white chocolate chips evenly over the batter. Pour the remaining batter on top and spread carefully to cover the chocolate completely.
5. Bake: Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs (not wet batter). The edges should be set and slightly pulling away from the pan. Be careful not to overbake; the brownies will continue to set as they cool.
6. Add marshmallows: Remove the brownies from the oven and immediately sprinkle the mini marshmallows evenly over the top. Return to the oven and bake for another 3-5 minutes, until the marshmallows are puffed and golden. For extra toastiness, you can broil on high for 30-60 seconds, watching closely to prevent burning.
7. Cool and slice: Let the brownies cool completely in the pan on a wire rack. For clean slices, refrigerate for at least 1 hour before cutting. Lift the brownies out using the parchment overhang and cut into squares with a sharp knife.

Pro-Tip: To get those perfect, clean cuts through the sticky marshmallows, dip your knife in hot water and wipe it dry between each slice.

Chef's Secrets for Success

• Use room temperature eggs: They incorporate more easily and create a smoother batter, leading to a better texture.
• Don't skip the salt: A little salt enhances the chocolate flavor and balances the sweetness.
• Watch the marshmallows closely: They can go from perfectly toasted to burnt in seconds, especially under the broiler. Stay by the oven.
• Chill before slicing: This is crucial for clean cuts and a fudgier texture. The brownies firm up as they cool.

Troubleshooting & Common Mistakes

• Brownies too cakey? You likely overmixed the batter or overbaked them. Mix just until combined and check for doneness a few minutes early.
• Marshmallows not toasting? Make sure your oven is fully preheated and use the broiler for a quick toast, but keep an eye on them.
• White chocolate layer not melting? Use good-quality white chocolate chips or chopped chocolate. If using chips, they may hold their shape slightly but will soften.
• Brownies sticking to the pan? Always line with parchment paper and leave an overhang for easy removal.

Storage, Make-Ahead & Reheating

Store leftover brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to 1 week. For longer storage, wrap individual brownies tightly in plastic wrap and freeze for up to 3 months. To serve, thaw at room temperature or microwave for 15-20 seconds to get that gooey marshmallow back. These brownies are best enjoyed slightly warm.

Frequently Asked Questions

Can I use large marshmallows instead of mini?

Yes, but cut them into quarters so they melt evenly and don't overwhelm the brownies.

Can I make these brownies gluten-free?

Absolutely. Substitute the all-purpose flour with a 1:1 gluten-free flour blend. The texture will be slightly different but still delicious.

How do I know when the brownies are done?

A toothpick inserted into the center should come out with a few moist crumbs, not wet batter. The edges should be set. Remember they'll firm up as they cool.

Can I double the recipe?

Yes, use a 9×13-inch pan and increase the baking time by about 5-10 minutes. Keep an eye on them.

These 5-ingredient fudgy marshmallow brownies are a guaranteed crowd-pleaser. The combination of rich chocolate, creamy white chocolate, and gooey toasted marshmallows is pure magic. Give them a try, and don't forget to share your creations!

⭐ Tested Recipe
Dessert • American

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5-Ingredient Fudgy Marshmallow Brownies

★★★★★
4.9
(42 reviews)

Rich, fudgy brownies with a surprise white chocolate layer and toasted marshmallow topping, made with just 5 main ingredients.

⏱️ Prep Time

15 mins

🔥 Cook Time

30 mins

⏳ Total Time

45 mins

🍽️ Servings

16 squares

⚡ Calories

280 kcal

🛒 Ingredients

• ✓1 cup (2 sticks) unsalted butter, melted
• ✓2 cups granulated sugar
• ✓4 large eggs
• ✓1 teaspoon vanilla extract
• ✓1 1/4 cups all-purpose flour
• ✓3/4 cup unsweetened cocoa powder
• ✓1/2 teaspoon salt
• ✓1 cup white chocolate chips
• ✓2 cups mini marshmallows

📋 Step-by-Step Instructions

1. 1Preheat oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper.
2. 2In a large bowl, whisk melted butter and sugar until combined. Add eggs one at a time, whisking well. Stir in vanilla.
3. 3In a separate bowl, whisk flour, cocoa powder, and salt. Fold into wet ingredients until just combined.
4. 4Pour half the batter into the pan. Sprinkle white chocolate chips evenly. Top with remaining batter and spread gently.
5. 5Bake for 25-30 minutes, until a toothpick comes out with moist crumbs. Remove from oven.
6. 6Sprinkle marshmallows over hot brownies. Return to oven for 3-5 minutes until puffed and golden. For extra toast, broil for 30-60 seconds, watching closely.
7. 7Cool completely on a wire rack, then refrigerate for 1 hour before slicing.