S’mores Cookie Bars

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If you’ve ever craved the magic of a campfire s’more without the hassle of smoke and sticky fingers, these S’mores Cookie Bars deliver it all in a bite-sized, oven-baked form. Buttery graham cracker base, gooey chocolate layers, and perfectly toasted marshmallows come together in a chewy bar that captures everything I love about the original treat—just a little neater.

What makes this recipe stand out is the cookie dough layer that hugs all the traditional s’mores flavors together. Instead of sandwiching chocolate and marshmallows between crackers, I fold them into a soft cookie dough that bakes up golden around the edges and stays irresistibly tender in the center. It’s layered nostalgia with a twist.

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What You’ll Need Visually

To make your prep extra simple, I’ve created a top-down visual reference of all the ingredients laid out on a clean marble surface. I always find it helpful to get a full view of everything before diving into the baking process—it keeps things smooth and minimizes mid-recipe scrambling. Feel free to save or print the image below as your visual prep guide.

The Ingredients That Make These S’mores Cookie Bars Work

Graham cracker crumbs set the foundation—they bring that toasty, buttery crunch you expect from any good s’more. I mix them with melted butter and just a bit of sugar to hold it together, creating a base that smells like summer the second it hits the oven.

Brown sugar is key in the cookie dough. It deepens the flavor and keeps the bars moist. I always use light brown sugar for its mellow caramel notes.

All-purpose flour gives structure without making the dough too dense, while a pinch of baking soda helps with just enough lift.

Mini marshmallows are a must—but timing is everything. I scatter them on top toward the end of baking so they toast instead of dissolving completely.

Semi-sweet chocolate chips melt into silky pockets that cut the sweetness of the marshmallows. You can swap in chopped Hershey bars for a more classic taste, but I find chips distribute better.

Vanilla extract smooths and rounds out the dough, while an egg binds everything together for that cookie-bar texture.

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How To Make the S’mores Cookie Bars

Step 1: Prep the Base

Preheat your oven to 350°F and line an 8×8-inch pan with parchment paper. Combine the graham cracker crumbs, melted butter, and sugar, then press the mixture firmly into the pan to create an even crust.

Step 2: Make the Dough

In a separate bowl, cream the butter and brown sugar until light and fluffy. Add in the egg and vanilla extract. Mix until smooth. Stir in flour and baking soda just until combined, then fold in chocolate chips.

Step 3: Layer and Bake

Spoon the cookie dough over the crust in dollops, then gently press it to cover. Bake for 18–20 minutes, until the top is just starting to turn golden.

Step 4: Add Marshmallows

Remove the bars from the oven and sprinkle the top evenly with mini marshmallows. Return to the oven for 5 more minutes, or until the marshmallows are puffed and lightly toasted.

Step 5: Cool and Cut

Let the bars cool completely in the pan—this helps them set and makes cutting cleaner. Once cool, lift them out with the parchment and slice into squares.

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Use the Right Pan for Best Results

I’ve tested these bars in both glass and metal pans, and metal wins every time. A metal pan distributes heat more evenly and encourages that golden crust underneath. Glass tends to overbake the edges before the center is done, and ceramic takes too long to heat up. If you only have glass, reduce the oven temp slightly and keep an eye on the timing.

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Marshmallows: Sticky, Sweet, and Never Skipped

I made the mistake of baking these once without the marshmallows on top—thought I’d save time. Big mistake. They looked like cookie bars, but didn’t taste like s’mores. The marshmallows puff up, toast lightly, and give that essential campfire sweetness. I add them in the last few minutes of baking to avoid total meltdown. Always use fresh ones—they toast better and keep their shape.

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Serving Information

• Servings: 16 bars
• Preparation Time: 15 minutes
• Baking Time: 23–25 minutes total
• Total Time: 40 minutes

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Tips for Making the Perfect S’mores Cookie Bars

Room temperature butter makes all the difference in the dough—it creams better and gives that soft-baked center we’re after. Pressing the graham crust firmly is key to a solid base that doesn’t crumble. And don’t skip the parchment lining; it makes lifting and slicing a breeze. If your marshmallows start browning too fast, just tent the pan with foil for the last couple minutes.

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Serving Suggestions

These bars are surprisingly versatile, whether you’re going casual or fancy. Here’s how I like to serve or gift them:

• Campfire Party Favorite: Serve warm with a drizzle of melted chocolate for true camp vibes.
• Holiday Dessert Tray Star: Slice small and arrange with fudge or peppermint bark.
• Back-to-School Lunch Treat: Wrap individually in wax paper and tuck into lunchboxes.
• Picnic Ready Snack: Pack into a tin with parchment between layers so they don’t stick.
• Edible Gift Box Treat: Stack in a clear bag, tie with twine, and add a handwritten tag.
• Weekend Brunch Sweet Bite: Serve next to a fruit tray and coffee for a little indulgence.

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Save This S’mores Bar Recipe on Pinterest and Let’s Chat

Don’t forget to pin this recipe to your Dessert Ideas, Backyard Party Recipes, or Easy Baking Treats boards. If you try a variation—maybe using white chocolate or peanut butter cups—I’d love to hear how it turned out. Drop a comment and let’s trade ideas!

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