S’mores Cookie Bars

S’mores Cookie Bars are a chewy cookie bar studded with melted chocolate, golden-toasted marshmallows, and a hint of crunchy graham cracker in every bite. Chewy cookie dough gives way to pools of melted chocolate and toasted marshmallow peaks, all layered over crunchy graham cracker crumbs for a nostalgic twist on classic campfire flavors. Ready in under an hour and perfect for a beginner-friendly dessert, these bars deliver gooey, sweet fun in every slice. Grab your baking pan and get ready to experience a campfire favorite right from your kitchen!

Key Ingredients

Before we dive into baking, let’s gather the essentials that make these S’mores Cookie Bars shine:

• 1 cup unsalted butter melted: Liquid fat that adds rich, tender texture and helps bind the dough.
• 1 cup granulated sugar: Sweetens the bars and contributes to slight crispness on the edges.
• 1 cup packed brown sugar: Adds moisture and a hint of caramel flavor.
• 2 large eggs: Provide structure and help the dough rise while keeping it chewy.
• 1 teaspoon vanilla extract: Enhances the flavors and adds a warm, sweet aroma.
• 2 1/2 cups all-purpose flour: Forms the base of the dough, ensuring the right density and chew.
• 1 teaspoon baking soda: Acts as a leavening agent to give a light, tender crumb.
• 1/2 teaspoon salt: Balances sweetness and strengthens the dough’s flavor.
• 1 cup chocolate chips: Melt into gooey pockets of chocolate throughout the bars.
• 1 1/2 cups mini marshmallows: Create those iconic toasted marshmallow peaks in every square.
• 1 cup graham cracker crumbs: Provide a crunchy, nostalgic layer reminiscent of classic s’mores.

How To Make S’mores Cookie Bars

Let’s walk through the steps to transform pantry staples into the ultimate s’mores mash-up. You’ll start by preparing your pan and mixing both wet and dry ingredients separately. Then comes the fun part: layering dough, graham crumbs, and marshmallows before finishing with the remaining dough on top. Once baked, these bars emerge with golden edges, bubbly marshmallow peaks, and a perfectly chewy center.

1. Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper, leaving an overhang for easy removal later.

2. In a large bowl, beat the melted butter with the granulated sugar and brown sugar until the mixture is light and creamy, about 2 minutes.

3. Add the eggs, one at a time, then pour in the vanilla extract, mixing until everything is well combined and smooth.

4. In a separate bowl, whisk together the all-purpose flour, baking soda, and salt until evenly distributed.

5. Gradually add the dry ingredients to the wet ingredients, stirring until just combined—avoid overmixing to keep the bars tender.

6. Fold in the chocolate chips until they’re evenly scattered through the dough.

7. Press half of the cookie dough evenly into the bottom of the prepared pan, creating a firm base layer.

8. Sprinkle the graham cracker crumbs evenly over the dough, then scatter the mini marshmallows on top in a single layer.

9. Drop spoonfuls of the remaining dough over the marshmallows and gently press to cover as much surface as possible.

10. Bake for 20 to 25 minutes, until the edges are golden and the marshmallows are lightly toasted on top.

11. Allow the bars to cool completely in the pan before using the parchment overhang to lift them out and slice into squares.

Serving Suggestions

These S’mores Cookie Bars are fantastic straight from the pan, but why not elevate the experience with a few simple touches? Whether you’re hosting guests or indulging your sweet tooth, here are some fun ways to serve:

• A la mode: Warm a bar slightly in the microwave and top with a scoop of vanilla ice cream for a dreamy contrast of hot and cold.
• Chocolate drizzle: Melt additional chocolate chips and drizzle over each slice to amp up the chocolate factor.
• Party platter: Cut into bite-sized squares and arrange on a decorative tray with fresh berries and pretzels for variety.
• Gift-ready treats: Wrap each cooled bar in parchment paper and tie with twine for a homemade gift that wows.

Tips For Perfect S’mores Cookie Bars

Baking these bars is all about timing and layering. Here are my go-to tricks to get that flawless bar every time:

• Let the bars cool completely before slicing to help them set for cleaner squares.
• Use a parchment-lined pan for easy removal and quick cleanup.
• For extra crunch, substitute half the mini marshmallows with pieces of full-size marshmallows.
• Store in an airtight container at room temperature for up to 3 days to maintain chewiness.

How To Store It

To keep your S’mores Cookie Bars tasting as delicious as the day you baked them, proper storage is key. Here’s how to maintain their chewy texture and gooey pockets:

• Store cooled bars at room temperature in a tight-sealing container to keep them soft and chewy.
• Place parchment paper between each layer to prevent the marshmallows from sticking together.
• Keep the container away from direct sunlight or heat sources to avoid melting the marshmallows.
• Enjoy within 3 days for the best balance of gooey marshmallow and crunchy graham crumbs.

Frequently Asked Questions

Here are quick answers to the questions I get most often—everything you need to nail these bars!

• Q: How long does it take to prepare and bake these S’mores Cookie Bars?

It takes about 15 minutes to prepare, which includes melting the butter, mixing the sugars, eggs, vanilla, dry ingredients, pressing the first dough layer, and adding the graham crumbs and marshmallows. Baking requires 20 to 25 minutes, and you should then allow at least 30 minutes for the bars to cool completely in the pan before slicing.

• Q: Why is it important to line the 9×13-inch pan with parchment paper?

Lining the pan with parchment paper prevents the cookie bars from sticking, makes it easy to lift the entire slab out for slicing, and simplifies cleanup. It also helps the edges bake evenly without becoming too dark.

• Q: How can I prevent the mini marshmallows from melting into the dough completely?

Press the first half of the dough firmly and evenly into the pan so it forms a stable base. Sprinkle the marshmallows on top of the graham cracker crumbs and gently drop spoonfuls of the remaining dough over them, taking care not to cover every marshmallow entirely. This layering helps them toast on top rather than sink into the batter.

• Q: Can I customize the texture or flavors in these bars?

Yes. For extra crunch and larger pockets of gooey marshmallow, substitute half the mini marshmallows with pieces of full-size marshmallows. You can also swap in chunky chocolate instead of chips or add a teaspoon of cinnamon to the dry ingredients for a subtle warming spice.

• Q: What’s the best way to store these S’mores Cookie Bars to keep them fresh?

Store the cooled bars in an airtight container at room temperature for up to three days. If you live in a warm climate, adding a layer of parchment between the bars and the lid helps prevent the marshmallows from sticking and becoming overly soft.

• Q: My bars are still too soft in the center after cooling. What should I do?

Make sure you baked them for the full 20 to 25 minutes until the edges are golden and the marshmallows are lightly toasted. If they’re still underbaked, cover the pan loosely with foil and return to the 350°F oven for an additional 3 to 5 minutes. Then allow another 30 minutes to cool before slicing.

What Makes This Special

These S’mores Cookie Bars tick all the boxes for a show-stopping yet effortless dessert: a buttery cookie base hugging gooey chocolate and toasted marshmallows, all with a satisfying graham cracker crunch. No campfire or stick required—just a well-lined pan and a sweet tooth. The layers bake into a perfect harmony of textures, delivering nostalgia in every bite. Feel free to print this page and tuck it into your recipe box—you’ll be craving these treats time and again. If you whip up a batch, drop a comment below with your results or any baking questions—I’m here to help!

Print Recipe

S’mores Cookie Bars

Author: Sophie Reynolds Courses: Dessert

Difficulty: Beginner Prep Time 20 mins Cook Time 25 mins Rest Time 20 mins Total Time 1 hr 5 mins

Calories: 500

Description

Chewy cookie dough gives way to pools of melted chocolate and toasted marshmallow peaks, all layered over crunchy graham cracker crumbs for a nostalgic twist on classic campfire flavors.

Ingredients

Scale

1/2x 1x 2x 3x

• 1 cup unsalted butter melted

• 1 cup granulated sugar

• 1 cup packed brown sugar

• 2 large eggs

• 1 teaspoon vanilla extract

• 2 1/2 cups all-purpose flour

• 1 teaspoon baking soda

• ¹⁄₂ teaspoon salt

• 1 cup chocolate chips

• 1 1/2 cups mini marshmallows

• 1 cup graham cracker crumbs

Instructions

1. Preheat oven to 350°F and line a 9x13-inch baking pan with parchment paper.
2. In a large bowl, beat melted butter with granulated sugar and brown sugar until creamy.
3. Add eggs and vanilla extract and mix until well combined.
4. In another bowl, whisk together flour, baking soda, and salt.
5. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
6. Stir in the chocolate chips.
7. Press half of the cookie dough evenly into the prepared pan.
8. Sprinkle graham cracker crumbs over the dough layer, then scatter mini marshmallows on top.
9. Drop spoonfuls of the remaining dough over the marshmallows and gently press to cover.
10. Bake for 20 to 25 minutes, until the edges are golden and the marshmallows are lightly toasted.
11. Allow bars to cool completely in the pan before slicing into squares.

Note

• Let the bars cool completely before slicing to help them set.
• Use a parchment-lined pan for easy removal.
• For extra crunch, substitute half the mini marshmallows with pieces of full-size marshmallows.
• Store in an airtight container at room temperature for up to 3 days.

Keywords: smores cookie bars, smores bar recipe, marshmallow cookie bars, chocolate chip bars, graham cracker dessert, easy dessert bars