S’mores Brownie Bars are the magical mashup you never knew you needed but won’t be able to stop thinking about! Imagine the nostalgia of gooey campfire s’mores layered over rich, fudgy brownies — that’s exactly what you get in every bite of these bars. Plus, they’re irresistibly easy to whip up, so whether you’re craving something cozy on a rainy afternoon or spicing up dessert for your next gathering, S’mores Brownie Bars turn any occasion into a celebration.

Ingredients You’ll Need
There’s beauty in simplicity, and these ingredients prove it! Every element in S’mores Brownie Bars plays a unique role — from the buttery base to the gooey marshmallow topping — coming together for layers of flavor and crunch that are pure joy.
- Butter: Creates that melt-in-your-mouth texture essential for a fudgy brownie base.
- Sugar: Adds sweetness and helps achieve a beautifully crackly top.
- Eggs: Bind everything together and give brownies their signature richness.
- Vanilla Extract: Brings warmth and depth, making the chocolate flavors pop.
- Cocoa Powder: The star that turns these into true chocolate brownies — use a good quality cocoa for best results.
- All-Purpose Flour: Lightly thickens the batter, balancing the fudginess so bars are sturdy yet tender.
- Salt: Just a pinch enhances every sweet and chocolaty note.
- Baking Powder: Lifts the brownies ever so slightly for the perfect bite.
- Mini Marshmallows: Toast up golden, creating that classic s’mores gooeyness.
- Graham Cracker Crumbs: Provide the beloved crunch and distinct flavor that screams s’mores.
- Chocolate Chips: Melt into puddles amidst the marshmallows, doubling down on chocolate decadence.
How to Make S’mores Brownie Bars
Step 1: Preheat and Prepare Your Pan
Start by preheating your oven to 175°C (350°F). Then, line an 8×8-inch baking pan with parchment paper. This little step ensures you can effortlessly lift those S’mores Brownie Bars out after baking (and means less cleanup too!).
Step 2: Whisk Together the Brownie Batter
In a mixing bowl, blend melted butter and sugar until smooth. Crack in your eggs and add the vanilla, then whisk until everything is glossy and unified. Next, stir in the cocoa powder, followed by the flour, salt, and baking powder. Mix just until combined — overmixing can make brownies tough, so take it easy! Pour your batter into the prepared pan and smooth the top with a spatula.
Step 3: Pile On the S’mores Topping
This is the fun part! Generously scatter mini marshmallows, graham cracker crumbs, and chocolate chips over the surface of your brownie batter. Every corner deserves to be covered for that iconic s’mores look and taste in every bar.
Step 4: Bake to Gooey Perfection
Slide the pan into your hot oven and bake for 25 to 30 minutes. You’ll know they’re ready when the brownies are set and marshmallows have bronzed just enough to look irresistible. Don’t overbake; you want fudgy, not dry!
Step 5: Cool and Slice
Let the bars cool for a short while before slicing — this helps keep them intact and makes cutting much neater. Once set, lift out your pan liner, slice into squares, and get ready to savor this campfire classic reimagined!
How to Serve S’mores Brownie Bars

Garnishes
For an extra flourish, top your S’mores Brownie Bars with a sprinkle of extra graham cracker crumbs or a drizzle of melted chocolate. If you want to get fancy, a dash of flaky sea salt will bring out the chocolate notes even more.
Side Dishes
Pair these treats with a cold glass of milk, a mug of hot cocoa, or your favorite scoop of vanilla ice cream. They also make a decadent finish after a casual dinner or backyard cookout, and their crowd-pleasing flavors work year-round.
Creative Ways to Present
Take these S’mores Brownie Bars to the next level by serving them slightly warm with toasted marshmallow fluff on top, or sandwich two bars together with ice cream for the ultimate s’mores brownie ice cream sandwich. Stack them on a rustic wood board for a fun, campfire-inspired party platter.
Make Ahead and Storage
Storing Leftovers
Your S’mores Brownie Bars will keep beautifully at room temperature for up to three days. Simply cover them tightly with plastic wrap or store in an airtight container to keep them moist and fresh.
Freezing
Planning ahead? Cool the bars completely, then wrap individual squares in plastic wrap and place them in a freezer bag. They’ll stay tasting amazing for up to two months. Thaw overnight at room temp whenever you need a quick treat.
Reheating
If you love a gooey, melty center, pop an individual S’mores Brownie Bar in the microwave for about 10–15 seconds before serving. The chocolate and marshmallow will turn beautifully melty, just like a real s’more.
FAQs
Can I double the recipe for a bigger pan?
Absolutely! Double all ingredients and bake in a 9×13-inch pan. You may need to add a few extra minutes to the bake time, so check doneness with a toothpick near the center.
Can I use regular marshmallows instead of mini?
Mini marshmallows work best for even coverage, but you can chop full-sized marshmallows into small pieces if that’s what you have on hand. Both will get nicely toasty!
How do I get clean slices without sticking?
The trick is letting your S’mores Brownie Bars cool slightly, then using a sharp knife cleaned between cuts. Chilling them in the fridge for 20–30 minutes before slicing can help if you want perfect lines.
Can I make S’mores Brownie Bars gluten free?
You sure can! Swap the all-purpose flour for your favorite 1:1 gluten-free blend, and use gluten-free graham crackers for the topping. The texture remains delightfully fudgy and satisfying.
What’s the best way to serve these at a party?
Cut the bars into bite-size squares for easy nibbling, or serve on a platter with skewers for a playful, camp-themed look. They’re always a conversation starter and disappear fast!
Final Thoughts
If you adore cozy, nostalgic desserts, you owe it to yourself (and your lucky friends or family) to bake a batch of S’mores Brownie Bars. They’re impossibly simple, wildly delicious, and guaranteed to put a smile on anyone’s face. Don’t wait for your next camping trip — these bars bring the spirit of s’mores right into your kitchen!
