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Gooey S’mores Brownie Bars

04.10.2025
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Gooey S’mores Brownie Bars

There’s something magical about combining two of the most beloved treats: brownies and s’mores. If you’re a fan of gooey chocolate, marshmallows, and that classic graham cracker crunch, then Gooey S’mores Brownie Bars are about to become your new favorite dessert. Whether you’re hosting a summer BBQ or simply satisfying a sweet tooth, these bars are the perfect balance of chocolatey indulgence and campfire nostalgia.

Let’s dive in and create these decadent bars that are guaranteed to impress!

Why You’ll Love Gooey S’mores Brownie Bars

I remember the first time I made s’mores brownie bars. It was a rainy Saturday afternoon, and I was craving the cozy feeling of a campfire treat without the hassle of going outdoors. As I pulled the bars from the oven, the smell of melted chocolate and toasted marshmallows instantly transported me to the warmth of a campfire. The combination of fudgy brownies, crunchy graham crackers, and sticky marshmallows was absolutely irresistible.

These bars are not only delicious but also ridiculously easy to make! No campfire required, and they can be baked and served in about an hour. They bring together the best parts of both desserts into one unforgettable treat.

Ingredients You’ll Need

The best part about these gooey s’mores brownie bars is that the ingredients are simple and easy to find. Here’s everything you’ll need:

  • 1 box of brownie mix (about 400g, plus ingredients listed on the box – usually eggs, oil, and water)
  • 1 cup graham cracker crumbs (about 100g)
  • 1/2 cup unsalted butter (115g), melted
  • 1 1/2 cups mini marshmallows (about 150g)
  • 1 cup semi-sweet chocolate chips (about 170g)
  • 1/4 cup all-purpose flour (about 30g)
  • 1/4 teaspoon salt

Step-by-Step Guide to Making Gooey S’mores Brownie Bars

Step 1: Preheat the Oven and Prepare the Pan

Preheat your oven to 350°F (175°C). Grease a 9×9-inch (23×23 cm) baking pan or line it with parchment paper for easy removal of the bars once they’re done. This ensures that the bars won’t stick and makes cleanup a breeze.

Step 2: Prepare the Brownie Mix

In a large mixing bowl, prepare the brownie mix according to the instructions on the box. Most brownie mixes will require you to add eggs, oil, and water. Once mixed, set it aside while you prepare the graham cracker crust.

Step 3: Make the Graham Cracker Crust

In a separate bowl, mix together the graham cracker crumbs (100g), melted butter (115g), and a pinch of salt. Stir until everything is well combined, and you have a crumbly mixture. Press this mixture evenly into the bottom of the prepared baking pan to create the crust.

Step 4: Layer the Brownie and Marshmallows

Pour the prepared brownie batter over the graham cracker crust, spreading it out evenly. Then, sprinkle mini marshmallows (150g) over the top of the brownie batter. You want the marshmallows to cover the surface, but don’t worry about them being perfect—this will create that gooey, melted marshmallow effect once baked!

Step 5: Add Chocolate Chips

Top the marshmallows with semi-sweet chocolate chips (170g). The chocolate chips will melt into the marshmallows as they bake, adding a rich layer of chocolatey goodness.

Step 6: Bake to Perfection

Bake the bars in the preheated oven for 30-35 minutes or until the edges are set and a toothpick inserted into the center comes out mostly clean (it’s okay if a little bit of brownie batter sticks to it because you want that gooey texture). During the last few minutes of baking, you’ll notice the marshmallows starting to brown slightly—that’s when you know it’s almost ready!

Step 7: Cool and Serve

Once your bars are done baking, remove them from the oven and allow them to cool in the pan for at least 10-15 minutes. This helps the bars set and makes them easier to cut. Once cooled, cut into squares and serve!


FAQs: Everything You Need to Know

Q1: Can I make these bars without a brownie mix?
Yes, absolutely! You can make homemade brownies from scratch if you prefer. Just make sure the consistency is thick enough to hold the marshmallows and chocolate chips on top.

Q2: Can I use regular-sized marshmallows instead of mini marshmallows?
Yes, you can! If using regular marshmallows, cut them in half or quarters to ensure they melt evenly over the top of the brownies.

Q3: Can I freeze these bars?
Yes, these bars freeze beautifully. Simply cut them into squares and place them in an airtight container. They’ll keep in the freezer for up to 2-3 months. Just let them thaw at room temperature before serving.

Q4: How can I make these bars even more indulgent?
For extra indulgence, you can swirl in some peanut butter or Nutella into the brownie batter before baking. You could also sprinkle some crushed toffee or caramel bits on top for an added texture and flavor!


Conclusion: Your New Favorite Dessert Awaits

Gooey S’mores Brownie Bars are the ultimate dessert, combining all the best flavors of s’mores with the indulgence of brownies. Whether you’re baking for a party, a family gathering, or just treating yourself, these bars will always hit the spot.

So what are you waiting for? Gather your ingredients, preheat the oven, and get ready to indulge in these gooey, chocolatey, marshmallow-filled bars that are sure to become a new favorite.


Pro Tip: Want to make your bars even more festive? Try adding a drizzle of chocolate sauce or a sprinkle of crushed graham crackers on top for a fun finishing touch! Enjoy!

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