S’mores Cookie Bars

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Imagine the gooey magic of classic campfire s’mores layered into thick, chewy cookie bars. That’s exactly what you get with these S’mores Cookie Bars—a nostalgic treat that brings melty marshmallows, rich chocolate, and buttery graham cracker flavor together in every bite. Perfect for parties, after-school treats, or simply indulging your sweet tooth, these bars are easy to bake and impossible to resist.

These cookie bars start with a soft graham cracker base, followed by a generous layer of chocolate and marshmallow fluff, then topped with another layer of cookie dough. They bake into golden perfection with melty pockets of chocolate and toasted marshmallow in every bite. Whether you’re hosting a summer barbecue or craving a winter comfort treat, these bars are your year-round answer to s’mores cravings.

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What Kind of Chocolate Should I Use for S’mores Cookie Bars?

For that classic s’mores flavor, milk chocolate is ideal—think Hershey’s bars or milk chocolate chips. They melt beautifully and pair perfectly with marshmallow and graham crackers. If you prefer a richer bite, semi-sweet chips are a great alternative.

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Ingredients for the S’mores Cookie Bars

• Graham cracker crumbs: These form the base and give that classic honey-sweet crunch. Make sure they’re finely crushed for even mixing.
• All-purpose flour: Adds structure to the cookie dough so your bars hold their shape.
• Butter: Use unsalted, softened butter for a rich flavor and soft cookie texture.
• Brown sugar & granulated sugar: Brown sugar adds moisture and chewiness, while granulated sugar helps with structure.
• Eggs: Essential for binding everything together.
• Vanilla extract: Enhances the sweetness and overall flavor.
• Baking soda: Helps the dough rise and keeps it light.
• Salt: Balances the sweetness and enhances flavor.
• Marshmallow fluff: Provides that gooey, sticky marshmallow layer we all love in s’mores.
• Milk chocolate chips or bars: Melts into that irresistible, creamy chocolate layer.
• Mini marshmallows (optional): For a toasty finish and extra marshmallow bites on top.

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How To Make the S’mores Cookie Bars

Step 1: Prepare the Dough Base

Start by preheating your oven to 350°F (175°C). Line a 9×13-inch baking dish with parchment paper, leaving some overhang for easy lifting later. In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy. Add in the eggs and vanilla extract, mixing until smooth.

Step 2: Mix the Dry Ingredients

In a separate bowl, whisk together the graham cracker crumbs, all-purpose flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, stirring until fully combined and the dough forms.

Step 3: Assemble the Layers

Press two-thirds of the cookie dough into the prepared baking dish, smoothing it out evenly. Next, spread a layer of marshmallow fluff over the dough. It helps to dollop spoonfuls across the surface and gently spread with a spatula. Then sprinkle an even layer of milk chocolate chips or lay down chocolate bar pieces over the marshmallow.

Step 4: Add the Top Layer

Take the remaining cookie dough and flatten portions between your hands or on parchment paper to create a patchwork layer over the top. It’s okay if some marshmallow peeks through—that’s part of the charm! For extra gooey goodness, press a handful of mini marshmallows and extra chocolate chips on top.

Step 5: Bake and Cool

Bake in the preheated oven for 25 to 30 minutes or until the top is golden brown and the edges are set. Allow the bars to cool completely in the pan before lifting out and slicing into squares. They will firm up as they cool, so resist the urge to cut too soon!

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How to Serve and Store S’mores Cookie Bars

S’mores Cookie Bars are best served slightly warm or at room temperature when the marshmallow is still a little gooey and the chocolate is soft. You can even pop them in the microwave for 10–15 seconds to bring back that just-baked feel. They’re perfect for dessert platters, lunchbox surprises, or cozy weekend movie nights.

To store, place the bars in an airtight container at room temperature for up to 4 days. If you prefer them firmer, refrigerate for a chilled treat. They also freeze well for up to 2 months—just wrap each bar individually in plastic wrap and place in a freezer-safe bag. Thaw at room temperature or microwave for a quick indulgence.

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Frequently Asked Questions

Can I use marshmallows instead of marshmallow fluff?

Yes! While fluff gives a more even, gooey layer, you can use mini marshmallows. Just know they may melt unevenly and caramelize slightly, which adds its own delicious charm.

Do I need to chill the dough before baking?

No chilling is required for this recipe. The dough is firm enough to hold its shape and bake evenly without extra refrigeration time.

Can I make these gluten-free?

Absolutely. Just substitute the all-purpose flour and graham crackers with your favorite gluten-free alternatives. Make sure they’re finely ground for the best texture.

What’s the best way to cut clean squares?

Let the bars cool completely, then use a sharp knife wiped clean between cuts. You can also chill the bars before slicing for ultra-neat edges.

Can I add peanut butter?

Yes! Swirl a few spoonfuls of peanut butter into the marshmallow layer before adding the chocolate for a rich, nutty twist.

Do these work as holiday gifts?

Definitely. Wrap cooled bars in wax paper or treat bags and tie with ribbon for a sweet, homemade gift that feels like a hug in cookie form.

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Want More Cookie Bar Ideas?

If these S’mores Cookie Bars hit the sweet spot, you’ll want to explore these delicious dessert bars and cookies that offer fun twists and new flavors:

• Pistachio Pudding Sugar Cookie Bars with a creamy and nutty surprise.
• Strawberry Cheesecake Banana Pudding for fruity, layered decadence.
• Cheesecake Stuffed Caramel Apple Cookies that are bursting with gooey fall flavors.
• Oreo Stuffed Cinnamon Rolls for a gooey chocolatey twist to your breakfast routine.
• Maraschino Cherry Chocolate Chip Cookies if you love a cherry-on-top kind of treat.

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Save This Pin + Share Your Results

📌 Save this recipe to your Pinterest dessert board so you can find it again when cravings hit.

And don’t forget to share your version of these bars in the comments—did you add peanut butter? Try white chocolate instead? I’m always excited to hear the creative spins you come up with!

Want more dessert inspiration? Browse my daily recipe creations on Pinterest at Life with Nina—your sweet tooth will thank you.

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