These Sheet Pan S’Mores Brownie Bars have become one of our favorite summer desserts. They have everything we love about the classic campfire treat. But instead of standing around the fire roasting marshmallows for twenty people, you bake one big pan and let everyone help themselves.
Campfire Cookouts
There’s something about the smell of toasted marshmallows that instantly brings back memories of summer evenings. Whether it’s a backyard bonfire, camping with family, or simply sitting on the porch watching the fireflies, s’mores have a way of bringing everyone together.
The only downside? Making traditional s’mores one at a time isn’t always practical when you’re feeding a crowd.
A buttery graham cracker crust holds a rich layer of fudgy brownies before being topped with toasted marshmallows, crunchy graham crackers, and melted chocolate. Every bite has that perfect combination of crunchy, gooey, and chocolatey goodness.
Whether you’re hosting a family reunion, church picnic, graduation party, neighborhood cookout, or simply enjoying a weekend on the homestead, this easy dessert is guaranteed to disappear quickly.
Why We Love This Recipe
One of the things we appreciate most about homestead cooking is finding simple ways to feed a lot of people without spending the entire day in the kitchen. This recipe checks all the boxes.
- Makes enough for a crowd
- Uses simple pantry ingredients
- Easy enough for kids to help make
- Perfect for summer gatherings
- Easy to customize with favorite candy bars
- Can be made ahead for parties and potlucks
Even better, there’s no campfire required.
Ultimate Sheet Pan S’Mores Brownie Bars for a Crowd
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Ingredients
Graham Cracker Crust
- 3 Cups Graham Cracker Crumbs about 3 sleeves
- 2/3 Cup Butter melted
- 6 Tablespoons Granulated Sugar
Brownie Layer
- 32.6 Ounces Brownie Mix 2 boxes (9×13 size)
- 2 Tablespoons Water
- ½ Cup Vegetable Oil
- 2 Large Eggs
S’Mores Topping
- 6 Cups Mini Marshmallows
- 6 Graham Cracker Sheets broken into pieces
- 1 Cup Milk Chocolate Chips
- 4 Chocolate Bars broken into squares
Instructions
How to Make Sheet Pan S’Mores Bars
- Preheat your oven to 350°F and generously grease a half-sheet pan.
- Mix together the graham cracker crumbs, melted butter, and sugar until everything resembles damp sand. Firmly press the mixture into the prepared pan and bake for 10 minutes.3 Cups Graham Cracker Crumbs, 2/3 Cup Butter, 6 Tablespoons Granulated Sugar
- Meanwhile, in a large bowl, add both brownie mixes, water, oil, and eggs. Mix until well blended. Spread the batter evenly over the baked crust and return the pan to the oven. Bake for 30 to 35 minutes, or until a toothpick inserted near the center comes out with only a few moist crumbs.32.6 Ounces Brownie Mix, 2 Tablespoons Water, ½ Cup Vegetable Oil, 2 Large Eggs
- Scatter the marshmallows, broken graham crackers, chocolate chips, and Hershey bar pieces over the warm brownies.6 Cups Mini Marshmallows, 6 Graham Cracker Sheets, 1 Cup Milk Chocolate Chips, 4 Chocolate Bars
- Move the pan to an upper oven rack and broil for 2 to 3 minutes until the marshmallows are beautifully toasted and golden brown. Stay nearby—broilers can go from perfectly browned to burnt in seconds.
- Allow the bars to cool completely before slicing. For the cleanest cuts, refrigerate the pan for about 20 minutes first. Cut into 24 squares.
Notes
Tips for Success
- Press the crust firmly so it doesn’t crumble when sliced.
- Don’t overbake the brownies—they should stay slightly fudgy.
- Watch the broiler carefully. Marshmallows toast quickly.
- Spray your knife with cooking spray or wipe it with a warm damp towel between cuts for bakery-style slices.
- Let the bars cool completely before cutting.
Nutrition
Make It Your Own with Variations
Campfire Classic
Stick with traditional Hershey chocolate and plenty of mini marshmallows for that nostalgic campfire flavor.
One of the best parts about this recipe is how easily you can customize it.
Peanut Butter Lovers
Swap the Hershey bars for chopped peanut butter cups. The melted peanut butter mixed with toasted marshmallows is absolutely delicious.
Cookies and Cream
Sprinkle crushed chocolate sandwich cookies over the marshmallows before broiling.
Salted Caramel
Add caramel bits and finish with a light sprinkle of flaky sea salt after baking.
Triple Chocolate
Mix milk chocolate, dark chocolate, and white chocolate chips together for an extra decadent dessert.
Storing Leftovers
If you happen to have leftovers, store them in an airtight container.
- Room temperature: up to 2 days
- Refrigerator: 4 to 5 days
The marshmallows will become slightly chewier after refrigeration, but they’ll still taste wonderful.
Can You Freeze Them?
Yes!
Wrap individual bars tightly in plastic wrap and place them inside a freezer-safe container.
Freeze for up to two months.
Allow them to thaw overnight in the refrigerator or on the counter for about an hour before serving.
Delicious Ways to Enjoy Leftovers
These bars are just as good the next day.
Try:
- Warming one in the microwave for 10 to 15 seconds.
- Serving with a scoop of vanilla ice cream.
- Packing them for camping trips.
- Including them in picnic lunches.
- Cutting them into bite-sized squares for dessert platters.
Can I make these the day before?
Absolutely. They’re a great make-ahead dessert for family gatherings.
Can I use homemade brownie batter?
Yes. Simply double your favorite 9×13 brownie recipe for a half-sheet pan.
Can I use large marshmallows?
Certainly. Just cut them into smaller pieces so they toast evenly.
What’s the best pan to use?
A standard half-sheet pan (approximately 18 x 13 inches) works perfectly.
Can kids help make this recipe?
Definitely! Little helpers can mix the crust, break graham crackers, sprinkle toppings, and help decorate before baking.
More Than Just Dessert
One of our favorite things about life on the homestead isn’t really the food—it’s the people gathered around the table. Recipes like these aren’t complicated or fancy. They’re simply meant to be shared.
Whether you’re hosting neighbors after helping bale hay, celebrating a family birthday, or ending a day spent working in the garden, desserts like these have a way of bringing everyone together.
Such a delicious way to feed a crowd at our house during the summer months. Adults and kids alike love this one.