If you’ve ever stood around a campfire, sandwiching gooey marshmallows and melty chocolate between crunchy graham crackers, you’ll know there’s nothing quite like a classic s’more. Now, imagine those dreamy flavors combined with rich brownies and chewy cookies, all in one incredible treat: Easy S’mores Brookie Bars. These bars are pure magic, layering brownies, graham crackers, marshmallows, and chocolate chip cookie dough into a dessert that disappears in minutes at any gathering. This is the recipe you’ll want on standby whenever you crave nostalgia, comfort, or an easy wow-factor dessert.

Ingredients You’ll Need

This recipe comes together with a handful of easy-to-find ingredients, but don’t be fooled by their simplicity. Each one plays a crucial role in building the signature taste and irresistible texture of these Easy S’mores Brookie Bars, from fudgy brownie bases to golden cookie tops and gooey pockets of toasted marshmallow.

Brownie mix: The rich and fudgy foundation, providing a deep chocolatey layer with minimal effort.
All-purpose flour: Essential for building the tender structure of the cookie layer.
Baking soda: Gives the cookie dough its beautiful lift and soft, chewy bite.
Kosher salt: Balances all the sweetness and elevates the chocolate notes.
Unsalted butter (melted): Adds flavor and moisture, making the cookies decadently rich.
Packed light brown sugar: Brings a butterscotch depth and chewy texture to the cookie dough.
Granulated sugar: Provides structure and sweetness, creating an ideal cookie crumb.
Vanilla extract: Enhances all the baked flavors and brings a warm, aromatic note.
Egg + egg yolk: Extra egg yolk ensures the cookie layer is ultra-tender and rich.
Graham crackers: That classic s’mores crunch and a toasty honey flavor in every bite.
Semisweet chocolate chips: Little gems of melted chocolate throughout the cookie layer.
Jumbo marshmallows: They melt just enough to become perfectly gooey, adding ooey-gooey pockets to the bars.
Refrigerated chocolate chip cookie dough (shortcut): Grab these for an even easier version without compromising flavor or texture.

How to Make Easy S’mores Brookie Bars

Step 1: Preheat and Prepare Your Pan

Preheat your oven to 350 degrees Fahrenheit. Give a 13×9-inch baking dish a good coating of butter or nonstick spray so your bars lift out easily later. This simple prep makes a world of difference when it’s time for bar-cutting action!

Step 2: Mix the Brownie Batter

Using your favorite 16 oz box of brownie mix, whip up the batter as the package instructs. This quick-fix brownie layer gives your Easy S’mores Brookie Bars a decadently fudgy base with almost zero effort.

Step 3: Prep the Cookie Dough (from scratch or shortcut!)

For homemade dough, whisk together flour, baking soda, and salt. In a separate bowl, cream the melted butter with brown and granulated sugars until blended. Beat in vanilla, whole egg, and egg yolk until light. Stir in dry ingredients and then chocolate chips. If you’re choosing the shortcut route, grab two packages of refrigerated chocolate chip cookie dough and you’re already halfway there!

Step 4: Assemble the Layers

Pour your brownie batter evenly into the prepared baking pan. Gently lay graham cracker sheets, slightly overlapping to cover the batter. Next, scatter jumbo marshmallows over the graham crackers for that iconic s’mores gooeyness. These layers work together to infuse each bite of your Easy S’mores Brookie Bars with all the flavors of a cozy campfire night.

Step 5: Top with Cookie Dough

Dot chunks of homemade or store-bought cookie dough evenly over the top. They don’t need to be perfectly spread; uneven crumbles create delicious pockets for the marshmallow to peek through as it bakes!

Step 6: Bake to Golden Perfection

Bake for 35–40 minutes, or until the cookie layer is beautifully golden and a toothpick inserted in the center comes out mostly clean (some gooey chocolate is just right!). If the cookie top begins to over-brown, gently tent the pan with foil for the last 10 minutes. Cool the bars completely before cutting for the cleanest results—waiting is the hardest part, but worth every second!

Step 7: Serve and Savor

Once cooled, cut into bars or squares using a sharp knife. For a truly unforgettable finish, dig in while they’re still slightly warm and pair with a generous scoop of vanilla ice cream.

How to Serve Easy S’mores Brookie Bars

Garnishes

Dress up each piece with a drizzle of melted chocolate, a sprinkle of graham cracker crumbs, or a dusting of powdered sugar for a bakery-style look. For a campfire vibe, torch a mini marshmallow and crown each bar just before serving.

Side Dishes

Pair these decadent bars with creamy vanilla ice cream, a cold glass of milk, or a hot cup of coffee. Their rich, layered flavors also shine alongside fresh strawberries or tangy raspberries, which help cut the sweetness and add splash of color.

Creative Ways to Present

For parties, cut the Easy S’mores Brookie Bars into bite-sized squares and stack on a tiered dessert tray. Pack them for picnics in wax paper for a whimsical, nostalgic touch, or wrap them with a ribbon as cheerful edible gifts.

Make Ahead and Storage

Storing Leftovers

Keep leftover Easy S’mores Brookie Bars in an airtight container at room temperature for up to 3 days. The bars remain chewy and moist, though the marshmallow may settle a bit—just another reason to sneak a piece every time you pass by!

Freezing

For long-term storage, wrap individual bars tightly in plastic wrap and place them in a zip-top bag. Freeze for up to 2 months. A quick zap in the microwave or a few minutes at room temperature revives their fresh-from-the-oven magic.

Reheating

If you want to enjoy your Easy S’mores Brookie Bars warm, microwave a piece for 10–12 seconds. The marshmallow will soften, and the chocolate chips will become wonderfully melty again—almost as good as a fresh batch.

FAQs

Can I use mini marshmallows instead of jumbo marshmallows?

Absolutely! Mini marshmallows are a great swap and will melt faster, creating more even gooeyness throughout the bars. Scatter them generously to mimic the jumbo effect.

What type of brownie mix works best for Easy S’mores Brookie Bars?

Any classic, fudge-style brownie mix will do the trick. If you’re a fan of extra gooeyness, pick a mix that emphasizes fudgy texture over cake-like. Gluten-free mixes work as well if you have dietary restrictions.

Can I make Easy S’mores Brookie Bars in advance?

Yes! These bars hold up beautifully when made a day ahead. Just cut and store them once completely cooled, and they’ll be just as delicious for your event or picnic.

What’s the best way to cut clean bars without a sticky mess?

Let the bars cool completely (even chill briefly in the fridge for ultra-neat edges) and use a sharp, lightly greased knife. Wipe the blade between cuts for the cleanest results.

Can I add nuts or swirl in peanut butter?

Of course! Chopped toasted pecans or walnuts add a delightful crunch, and dolloping peanut butter between the graham cracker and marshmallow layers elevates these Easy S’mores Brookie Bars to new heights.

Final Thoughts

If you love classic s’mores, brownies, and cookies, these Easy S’mores Brookie Bars are simply irresistible—a recipe that will quickly become your family favorite. Don’t be surprised if they vanish in record time. Give them a try and let a little campfire magic brighten up your next dessert table!