Oh boy, do I have a treat for you! You know how sometimes you just crave that perfect blend of gooey, chocolatey, toasted goodness? Well, get ready, because these S’mores Brownie Bars are about to become your new best friend. They take everything you love about campfire s’mores – the melty marshmallows, the crunchy graham crackers, the rich chocolate – and bake it all into the fudgiest, chewiest brownie you’ve ever had. Seriously, my kids practically inhaled the first batch. They’re so easy, too; no fancy techniques needed, just pure, unadulterated deliciousness packed into one perfect bar.

Why You’ll Love These S’mores Brownie Bars
These bars are just ridiculously good. You’ll love them because:
- They’re surprisingly simple to whip up – no complicated steps, trust me!
- That amazing s’mores taste meets a perfectly chewy brownie. It’s a match made in heaven.
- Seriously, they disappear in minutes at any gathering. Everyone goes wild for them!
- The texture is just spot-on: chewy brownie, a little crunch from the graham cracker, gooey chocolate, and perfectly toasted marshmallows. Pure bliss!
Gather Your Ingredients for S’mores Brownie Bars
Alright, let’s get down to business! To make these absolutely irresistible S’mores Brownie Bars, you’ll need to round up a few key players. Don’t worry, it’s all pretty standard stuff you probably have hanging around!
First up, for that rich, fudgy brownie base, we’ll need 1 cup of unsalted butter, melted. Then, we’ll sweeten things up with 2 cups of granulated sugar. For binding and that classic brownie structure, grab 4 large eggs, and a teaspoon of pure vanilla extract to add that warm aroma. Flour is next, 1 and 1/2 cups of all-purpose flour will do the trick. We can’t forget the deep chocolate flavor, so get ready with 3/4 cup of unsweetened cocoa powder. A little lift comes from 1/2 teaspoon of baking soda and just a pinch of salt (1/4 teaspoon) to make all those flavors pop!
Now for the s’mores magic! You’ll need 1 cup of semi-sweet chocolate chips – I love using these because they melt so beautifully. For that gooey, toasted topping, we’re grabbing 1 cup of mini marshmallows. And of course, no s’mores bar is complete without 1 cup of graham cracker crumbs. Make sure you have them ready to go!
Crafting Your Perfect S’mores Brownie Bars: Step-by-Step
Okay, now for the fun part! Making these S’mores Brownie Bars is surprisingly straightforward, and following these steps will have you sinking your teeth into gooey goodness in no time. Don’t worry, it’s all about layering that deliciousness!

Preparing the Pan and Oven
First things first, let’s get our oven nice and warm. Preheat it to 350°F (175°C). While that’s heating up, grab your 9×13 inch baking pan. A good coat of grease and flour is essential here – it’s the secret to getting those bars out clean later. Trust me, no one wants a brownie stuck to the pan!
Mixing the Brownie Batter
Now for the magic dough! In a big ol’ bowl, whisk together that melted butter and sugar until they’re good buddies. Then, crack in your eggs one by one, giving it a good whisk after each. Pour in the vanilla extract and give it another stir. In a separate bowl, whisk together your flour, cocoa powder, baking soda, and salt. You want to make sure all those dry ingredients are nicely combined before adding them to the wet stuff. Gradually add the dry mix to the wet, stirring *just* until it all comes together. Seriously, don’t go crazy mixing here; overmixing is the enemy of chewy brownies! If you want to dive deeper into creating super gooey chocolate recipes, check out this guide.
Assembling the S’mores Brownie Bars
Time to build these beauties! Spread about half of that glorious brownie batter evenly into your prepared pan. It might be a little thick, so just do your best to get a nice, even layer. Next, sprinkle all those graham cracker crumbs right over the top of the batter. Gently press them in a little. Now, scatter your chocolate chips evenly over the crumbs. Finally, dollop the rest of the brownie batter over the chocolate chips, spreading it out as best you can to cover everything.
Baking and Toasting the Marshmallows
Pop that pan into the preheated oven and let it bake for about 25 to 30 minutes. You’re looking for a toothpick inserted into the center to come out with moist crumbs attached – we want chewy, not dry! As SOON as they come out, sprinkle those mini marshmallows all over the top. Don’t wait! Pop it back into the oven for just another 2-3 minutes, or until those marshmallows are puffed up and just starting to get a lovely golden kiss. For super gooey marshmallows, you can even use the broiler for about 30-60 seconds, but watch them like a hawk – they go from toasted to burnt in a blink!

Tips for S’mores Brownie Bar Success
Alright, so you’ve got the recipe, but let’s talk about taking these S’mores Brownie Bars from *great* to *OMG-I-need-another-one*! A few little tricks can make all the difference. First off, don’t skimp on the quality of your cocoa powder; a good unsweetened cocoa makes that brownie flavor sing. And speaking of singing, remember that “don’t overmix” rule for the batter? It’s GOLDEN for getting that perfect chewy texture. If you can’t get enough of chocolatey goodness, you might want to peek at this chocolate chip cookie recipe for more ideas.
When it comes to those marshmallows, make sure they’re fresh! Old marshmallows just don’t get that same puffy, toasty magic. Also, if your oven runs a little hot, keep a close eye on those marshmallows during the final broiling step – they can burn in a flash! If you ever need more tips on perfect baking textures, I’ve got you covered; these bars are right up there with my favorite cookies.
Ingredient Notes and Substitutions
Let’s chat about a couple of things in this recipe that you might want to tweak or just understand better! For the chocolate chips, semi-sweet is my go-to because it has a lovely balance, but if you’re a milk chocolate fan, go right ahead and swap them out! Milk chocolate chips will make these even sweeter and creamier, which is never a bad thing. As for the graham crackers, any kind works, really! You can use honey, cinnamon, or even chocolate graham crackers for an extra layer of flavor. If you can’t find mini marshmallows, just chop up some regular-sized ones, but be warned, they might melt a bit faster!
Serving and Storing Your S’mores Brownie Bars
Okay, so you’ve made these incredible S’mores Brownie Bars, and now the big question: how to enjoy them perfectly? I honestly think they’re best when they’re a little warm, maybe just 20-30 minutes after they come out of the oven, so the marshmallows are still super gooey and the chocolate is melty. A tall glass of cold milk is basically mandatory with these! And if you’re looking for more bar inspiration, you HAVE to check out these amazing Turtle Bars!
Got leftovers? Lucky you! Store them in an airtight container at room temperature for up to 3 days. They’re still delicious even after a day or two, and the gooiness mostly holds up!

Frequently Asked Questions about S’mores Brownie Bars
Got questions about these delightful S’mores Brownie Bars? I’ve got you covered! Here are some common things folks ask:
Can I make these vegan?
You sure can try! To make these vegan, you’ll want to look for vegan butter, flax eggs (1 tbsp flax meal + 3 tbsp water per egg, let sit for 5 mins), vegan chocolate chips, vegan marshmallows, and ensure your graham crackers are also vegan. The result will be slightly different, but totally doable!
How do I get perfectly toasted marshmallows?
The trick is to toast them right when the bars come out of the oven, when they’re still piping hot! The residual heat helps them puff up and get toasty. You can also pop them under the broiler for a minute, but watch them like a hawk – they go from golden brown to burnt super fast!
Can I use different types of chocolate?
Absolutely! While I love semi-sweet for a nice balance, feel free to use milk chocolate chips for a sweeter bar, or even dark chocolate chips if you prefer a richer, less sweet flavor. You could even throw in some chopped chocolate chunks for extra melty pockets!
How do I ensure my brownies are chewy and not cakey?
The key to chewy brownies is mostly in the mixing! Make sure you don’t overmix the batter once you add the flour, and definitely don’t overbake them. Pull them out when a toothpick still has moist crumbs attached – that’s what keeps them perfectly fudgy and chewy.
Nutritional Information (Estimated)
Just a heads-up, folks! The nutritional info for these amazing S’mores Brownie Bars is just an estimate, you know? It can totally change depending on the brands you use and exactly how you measure things. But generally speaking, each bar is around 250 calories. You’re looking at about 12g of fat, 35g of carbs, and 3g of protein per serving. Pretty much what you’d expect from a treat like this – totally worth it!