Get ready to fall head over heels for S’mores Bars, the irresistible treat that brings the nostalgia of campfires and gooey marshmallows right into your kitchen. This decadent combination of fudgy brownie, gooey marshmallow creme, buttery graham crackers, and chewy cookie is truly something special. Each bite is a dazzling dance of textures and flavors that’s both comforting and crave-worthy. Whether you’re baking for a party, a family movie night, or indulging in a sweet moment for yourself, S’mores Bars deliver all the magic of classic s’mores—no camping required.

Ingredients You’ll Need

You won’t believe how easily these S’mores Bars come together with just a few classic pantry staples and a handful of treats from the baking aisle. Each ingredient plays a vital role in building the irresistible layers and bursting flavors of this dessert—the secret is in the details!

Betty Crocker Cookie Brownie Mix (17.4 ounces): This box mix does double duty and sets the foundation for that rich, chocolatey base.
Unsalted Butter (6 tablespoons, melted + 1/4 cup, softened): Adds depth, richness, and helps bind the layers together for chewy perfection.
Large Egg (1) & Egg Yolk (1), both room temp: The egg provides structure, while the extra yolk ensures a soft, fudgy texture.
Heavy Whipping Cream (4 tablespoons, divided): Makes both the brownie and cookie layers extra silky and deliciously tender.
Salt (1/8 teaspoon, divided): A pinch brings out all the flavors and balances the sweetness.
Marshmallow Creme (1 cup): The secret to achieving that classic s’mores gooeyness without a fire pit.
Semi-Sweet Chocolate Chips (1 cup, divided): Melty pools of chocolate in every bite make these bars outrageously good.
Rough Chopped Graham Crackers (1 1/2 cups, divided): Adds crunch, color, and that signature s’mores flavor throughout every layer.
All-Purpose Flour (4 tablespoons): Firms up the cookie layer, keeping it chewy but not crumbly.
Light Brown Sugar (1/4 cup, firmly packed): Boosts that irresistible caramel sweetness and chewy texture.
Vanilla Bean Paste (1 tablespoon): Gives the cookie dough a fragrant, bakery-style finish (use extract if needed, but paste is a treat!).
Mini Marshmallows (1/2 cup): Toast up on top for that authentic fireside look and melt-in-your-mouth feel.
Flakey Sea Salt: A pinch on top makes the sweet flavors really pop and adds the dreamiest finish.
Nonstick Cooking Spray & Parchment Paper: Essential for easy bar removal—don’t skip this step!

How to Make S’mores Bars

Step 1: Prep Your Baking Station

First, set yourself up for stress-free baking. Position your oven rack in the center and preheat the oven to 325°F. Grab an 8×8-inch baking pan, give it a generous hit of nonstick spray, and then line it neatly with parchment paper, leaving a bit of overhang—trust me, this’ll make your S’mores Bars lift smoothly from the pan later.

Step 2: Mix the Brownie Layer

Melt 6 tablespoons of unsalted butter in a microwave-safe bowl until liquid and fragrant. Let it cool for just a moment, then pour it into a large bowl with the cookie brownie mix. Stir until combined, then add 2 tablespoons of heavy whipping cream and 1/8 teaspoon salt. Mix in the large egg and extra yolk—stir until you have a luscious, glossy batter. Spread this evenly into your prepared pan using a spatula.

Step 3: Assemble Marshmallow and Graham Layers

Scoop out all that heavenly marshmallow creme and gently spread it over the brownie layer, keeping it just shy of the pan edges so the goo stays centered. Sprinkle half a cup of chocolate chips on top, followed by a generous cup of chunky graham cracker pieces—these give your S’mores Bars their unmistakable s’mores charm!

Step 4: Make the Cookie Layer

In a clean mixing bowl, combine the cookie mix with 4 tablespoons all-purpose flour, 2 tablespoons heavy cream, 1/4 cup softened butter, 1/4 cup firmly packed light brown sugar, vanilla bean paste, and 1/8 teaspoon salt. Stir until thick and soft. Divide this dough into 4 or 5 balls, flatten each gently with your hand, and patch them on top of the marshmallow and graham layers, leaving a few peekaboo marshmallow spots for a gooey reveal.

Step 5: Bake to Perfection

Bake your masterpiece at 325°F for 40 to 50 minutes. Start checking at the 40-minute mark: you want the edges set but the center still just a bit soft and gooey. A toothpick in the center should come out with fudgy crumbs, not raw batter. Remember, the bars will firm up as they cool, so don’t overbake!

Step 6: Top Off and Cool

As soon as your bars come out of the oven, press in the remaining 1/2 cup chocolate chips, 1/2 cup chopped graham crackers, and 1/2 cup mini marshmallows. For the finishing touch, dust the top lightly with flakey sea salt. Let the S’mores Bars cool completely on a wire rack before lifting out of the pan and slicing into 16 gooey, irresistible pieces.

How to Serve S’mores Bars

Garnishes

These S’mores Bars are already the picture of decadence, but that doesn’t mean you can’t gussy them up further! A sprinkle of extra mini marshmallows, a handful of chocolate chunks, or a light drizzle of melted chocolate takes them into showstopper territory. And don’t skip the final sprinkle of flakey sea salt for a sophisticated sweet-and-salty hit!

Side Dishes

Given how rich these bars are, something cool or creamy pairs beautifully on the side. Try serving with a big scoop of vanilla ice cream or a dollop of whipped cream. For a fun party spin, set out fresh berries or slices of juicy fruit for a refreshing contrast.

Creative Ways to Present

Dress up your S’mores Bars platter-style for a potluck, or arrange them in pretty cupcake liners for single-serve treats at showers and birthdays. For a playful dessert board, slice them into small squares and mix with fruit, pretzels, and nuts. Want to go all out? Stack two bars and sandwich a scoop of ice cream between—the ultimate S’mores Bars ice cream sandwich!

Make Ahead and Storage

Storing Leftovers

If you’re lucky enough to have leftovers, store cooled S’mores Bars in an airtight container at room temperature for up to three days. The layers stay soft and chewy, and the flavors actually deepen as they rest—almost impossible to resist grabbing another piece.

Freezing

To freeze, wrap individual bars tightly in plastic wrap and then tuck them into a freezer-safe bag or airtight container. They’ll stay fresh for up to two months. When those chocolate cravings hit, just grab and go—no defrost needed if you like them a bit chilled!

Reheating

To recapture that fresh-baked, gooey S’mores Bars magic, microwave a bar for 10-15 seconds. The chocolate will melt, the marshmallow will ooze, and you’ll be transported right back to a campfire sunset—pure comfort in seconds.

FAQs

Can I use homemade brownie or cookie dough instead of a boxed mix?

Absolutely! If you have a favorite brownie or cookie dough recipe, feel free to use it as the base layers. The boxed mix simply makes things speedy and foolproof, but homemade versions are equally delicious.

What’s the trick for spreading marshmallow creme without making a mess?

Lightly coat your spatula (or even your fingers) with nonstick spray or a touch of oil before spreading the marshmallow creme. Start in the center and gently work your way outwards, keeping the layer just short of the pan’s edges.

Can I use regular-sized marshmallows instead of marshmallow creme or minis?

Marshmallow creme gives that uniform gooeyness, but you can use chopped regular marshmallows in a pinch. Scatter them in an even layer and gently press down so they melt into the bars as they bake.

Are S’mores Bars safe to transport for picnics or bake sales?

Definitely! Once cooled and cut, S’mores Bars hold their shape nicely. Stack them with parchment between layers in a container, and they’ll travel beautifully to any event.

How do I get perfectly clean slices?

Let the bars cool completely before cutting, and use a sharp knife wiped clean between each slice. A little patience pays off with neat, drool-worthy squares!

Final Thoughts

If there’s one treat that’s guaranteed to bring smiles, it’s these S’mores Bars—fudgy, gooey, crunchy, and nostalgic in every bite. Gather your favorite people, bake up a batch, and watch these disappear faster than a marshmallow over a campfire. Trust me, you’ll be making them again and again!

S’mores Bars Recipe

★★★★★

4.9 from 9 reviews

Author: Sophie
Total Time: 1 hour 10 minutes
Yield: 16 bars 1x
Diet: Vegetarian

Print Recipe

Description

These decadent S’mores Bars are a delightful twist on the classic campfire treat, featuring layers of rich brownie, gooey marshmallow, and crunchy graham crackers. Perfect for satisfying your sweet tooth!

Instructions

Preheat the oven: Place a rack in the center of the oven and preheat to 325°F.
Prepare the pan: Coat an 8×8 baking pan with nonstick spray and line with parchment paper.
Prepare the brownie layer: Melt butter, mix with brownie ingredients, spread in pan.
Add marshmallow and chocolate layers: Spread marshmallow creme, chocolate chips, and graham crackers over brownie layer.
Prepare the cookie layer: Mix cookie ingredients, divide into balls, flatten, and place on top of marshmallow layer.
Bake: Bake at 325°F for 40-50 minutes.
Cool and garnish: Cool, then top with chocolate chips, graham crackers, mini marshmallows, and sea salt.
Serve: Cut into 16 pieces and enjoy!

Notes

For gooey bars, do not overbake.
Optional: Drizzle with chocolate or caramel sauce before serving.

Prep Time: 20 minutes
Cook Time: 40-50 minutes
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 bar
Calories: 280
Sugar: 18g
Sodium: 170mg
Fat: 14g
Saturated Fat: 8g
Unsaturated Fat: 5g
Trans Fat: 0g
Carbohydrates: 34g
Fiber: 1g
Protein: 3g
Cholesterol: 30mg

Keywords: S’mores Bars, dessert, brownie, marshmallow, graham crackers, homemade, sweet treat