S’mores Stuffed Brownies Gooey Marshmallow

Imagine the nostalgic, smoky flavor of a campfire s’more merged with the dense, fudgy decadence of a homemade brownie. These S’mores Stuffed Brownies are the ultimate dessert mashup, featuring a buttery graham cracker crust, a rich chocolate center, and a molten layer of gooey marshmallows that stretch with every bite. You do not need a fire pit to enjoy this classic summer treat; your oven does all the heavy lifting to create a multi-layered masterpiece that satisfies every sweet craving. Whether you are hosting a backyard barbecue or just want to treat yourself on a Tuesday night, these brownies deliver a symphony of textures that will have everyone reaching for seconds.

Recipe Information

• Prep Time: 20 minutes
• Cook Time: 40 minutes
• Total Time: 60 minutes
• Servings: 16 squares
• Difficulty: Medium

Nutrition values

• Calories: 345 kcal
• Protein: 4g
• Carbs: 48g

Why Make This S’mores Stuffed Brownies Gooey Marshmallow

This recipe transforms a standard brownie into an architectural wonder of dessert. The graham cracker base provides a necessary crunch that offsets the soft, fudgy brownie layer. By stuffing the center with actual chocolate bars and jumbo marshmallows, you create a “lava” effect that stays gooey even after the brownies cool. It is the perfect recipe for those who love high-contrast textures—crunchy, chewy, and melt-in-your-mouth soft all at once. Plus, it is a guaranteed crowd-pleaser that looks far more impressive than a basic boxed mix, despite being relatively simple to assemble.

Ingredients

• 1 ½ cups graham cracker crumbs (about 10-12 full sheets)
• 6 tablespoons unsalted butter, melted
• 1 cup unsalted butter, melted and slightly cooled (for brownie)
• 2 cups granulated sugar
• 4 large eggs, room temperature
• 1 tablespoon vanilla extract
• ¾ cup unsweetened cocoa powder
• 1 cup all-purpose flour
• ½ teaspoon salt
• 2 cups mini marshmallows or 16 jumbo marshmallows
• 2 large Hershey’s chocolate bars (broken into pieces)

Directions

Step 1: Prepare the Graham Cracker Crust

Preheat your oven to 350°F (175°C). Line an 8×8 inch square baking pan with parchment paper, leaving an overhang on the sides for easy removal. In a small bowl, mix the graham cracker crumbs with the 6 tablespoons of melted butter until the mixture resembles wet sand. Press this mixture firmly into the bottom of your prepared pan. Bake the crust for 8 minutes, then remove it from the oven and set it aside to cool slightly while you prepare the batter.

Step 2: Mix the Brownie Batter

In a large mixing bowl, whisk together the 1 cup of melted butter and granulated sugar until well combined. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract. Sift in the cocoa powder, flour, and salt. Gently fold the dry ingredients into the wet ingredients using a spatula until just combined. Do not overmix, as this will make the brownies cakey rather than fudgy.

Step 3: Layer the S’mores Filling

Pour approximately half of the brownie batter over the pre-baked graham cracker crust and spread it into an even layer. Arrange the chocolate bar pieces evenly across the batter. Place the marshmallows on top of the chocolate. If using jumbo marshmallows, you may want to tear them in half to ensure the layer isn’t too tall. This hidden center is what creates that signature “stuffed” gooeyness.

Step 4: Top and Bake

Carefully drop dollops of the remaining brownie batter over the marshmallow and chocolate layer. Use an offset spatula to gently spread the batter to the edges, sealing the filling inside. It is okay if some marshmallows peek through. Place the pan in the oven and bake for 30 to 35 minutes. The center should still have a slight jiggle, and a toothpick inserted into the brownie portion (avoiding the marshmallow) should come out with a few moist crumbs.

Step 5: Cooling and Slicing

Remove the pan from the oven and let the brownies cool completely in the pan for at least 2 hours. This is the hardest part, but it is crucial for the marshmallow and chocolate to set enough to slice. Once cooled, lift the brownies out using the parchment paper overhang. Use a sharp, lightly greased knife to cut them into 16 squares. For an extra toasted look, you can briefly torch the tops of any exposed marshmallows before serving.

Expert Tips for Perfect S’mores Stuffed Brownies Gooey Marshmallow

To get the cleanest cuts, chill the brownies in the refrigerator for an hour before slicing. Marshmallows are notoriously sticky, so wiping your knife with a damp cloth between cuts prevents the filling from dragging. If you prefer an even gooier experience, pop a sliced brownie in the microwave for 10 seconds before eating. Also, always use high-quality cocoa powder; since it is the primary flavor profile of the brownie, a Dutch-processed cocoa will provide a much deeper, smoother chocolate taste than standard grocery store brands.

Delicious Variations

If you want to shake things up, try swapping the graham cracker crust for a Biscoff cookie crust to add a hint of spice. For a salty-sweet twist, replace the graham crackers with crushed pretzels. You can also add a layer of peanut butter cups in the middle alongside the marshmallows for a “Fluffernutter” style brownie. If you love a toasted topping, sprinkle extra mini marshmallows on top during the last 5 minutes of baking and turn on the broiler for 30 seconds until they turn golden brown.

Frequently Asked Questions

Can I use a box brownie mix for this recipe?

Yes, you can substitute the homemade brownie batter with your favorite family-size box mix. Follow the box instructions to prepare the batter, but follow this recipe’s steps for layering the crust and the s’mores filling.

How do I store these brownies?

Store the brownies in an airtight container at room temperature for up to 3 days. If you need them to last longer, you can refrigerate them for up to a week, but they are best enjoyed at room temperature for the best texture.

Can I freeze s’mores brownies?

You can freeze them, but be aware that the texture of the marshmallow may change slightly once thawed. Wrap individual squares tightly in plastic wrap and store them in a freezer bag for up to 2 months. Thaw at room temperature before eating.

My marshmallows melted into the batter, what happened?

Marshmallows tend to dissolve if they are overbaked or if the batter is too thin. Ensure you are using fresh marshmallows and that you don’t overbake the brownies. Using jumbo marshmallows cut in half often helps them retain their shape better than mini marshmallows.

Can I use marshmallow fluff instead of whole marshmallows?

You can use marshmallow fluff, but it behaves differently than solid marshmallows. Fluff tends to blend into the batter more during baking, creating a marbled effect rather than a distinct gooey layer. If you use fluff, dollop it sparingly to prevent it from boiling over the edges.

Conclusion

These S’mores Stuffed Brownies are more than just a dessert; they are an experience. By combining the crunch of graham crackers, the richness of dark cocoa, and the nostalgic stretch of toasted marshmallows, you create a treat that appeals to both kids and adults alike. They are decadent, messy in the best way possible, and incredibly satisfying. Bake a batch for your next gathering, and watch them disappear in minutes. Enjoy the gooey goodness!