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One of the first recipes I shared on this blog was for the chewy chocolate chip cookie bars. All these years later and I'm still in love with that recipe. It's so versatile and produces delicious chewy cookie bars. We're using that recipe as our base today, but we're modifying it a bit by adding milk chocolate, graham cracker crumbs, and marshmallows. That's right...we're making s'mores cookie bars this time! You're going to love the flavor and ease of this recipe.

REASONS YOU SHOULD TRY THIS RECIPE:

Chewy, chocolatey & gooey goodness in a bar

Easy to carry and eat on the go

Get your s'mores fix

HOW TO MAKE CHEWY S'MORES COOKIE BARS:

Prep your 8x8" or 9x9" square baking pan by lining it with parchment paper or aluminum foil leaving some excess hanging over the sides. Grease well with cooking spray. Preheat your oven to 350°F.

Melt the butter and add it to a large mixing bowl. Next, add in both the granulated sugar and brown sugar. Whisk everything until the mixture is well combined.

Now, add in the egg and egg yolk one at a time, beating well between each addition. Add in the vanilla extract and instant coffee granules and whisk until the mixture is smooth and well combined.

In a medium bowl, combine all your dry ingredients including the all-purpose flour, graham cracker crumbs, salt, and baking soda. Mix the dry ingredients until combined and then dump this dry mixture all at once into the wet ingredients.

Next, add the marshmallows and chocolate all at once. Fold everything together until just combined and it resembles cookie dough. It’s important to fold it in gently because we don’t want to overmix. If a bit of flour is visible, that's fine.

Dump the dough into your prepared baking pan. Using your clean hands begin to press down on the down and spread it as evenly as possible in the pan. You can also use the bottom of a measuring cup if you prefer, but I just find using your hands is easier. Once you're satisfied with the evenness of the dough, you can place a few more chocolate chips and marshmallows and slightly press them in on top.

Baking

Place the pan in the oven and turn the temperature down to 325°F. Bake at 325°F for 25-30 minutes. It depends on how hot your oven is, but I would check it at 20 minutes regardless. You want it slightly undercooked because it will continue to cook as it cools, similar to actual cookies. For me 25 minutes was perfect and then I let it cool in the pan for another 10-15 minutes. Out of the oven, it will appear puffy, but as it cools it will shrink down a bit.

Once they cool slightly, they'll set up more but they'll remain soft and chewy. Cut them into squares and enjoy them warm!

SOME MORE GREAT BAR RECIPES:

Chewy Smore Cookie Bars

Homemade Chewy Smore Cookie Bars

Print Recipe Pin Recipe

Cook Time 25

Total Time 25

Course Desserts

Servings 16

Ingredients

2 ¼ cup all-purpose flour
½ teaspoon salt
½ teaspoon baking soda
1 cup brown sugar packed
½ cup granulated sugar
1 large egg
1 large egg yolk
2 teaspoons vanilla extract
⅛ teaspoon Nescafe Taster's Choice House Blend Instant Coffee Light
½ cup Ghirardelli milk and semisweet chocolate chips and discs
2 oz semisweet Ghirardelli baking bar
¾ cup marshmallows dehydrated or stale
¾ cup graham cracker crumbs
12 tablespoons unsalted butter melted

Instructions

Prep your 8x8" or 9x9" square baking pan by lining it with parchment paper or aluminum foil leaving some excess hanging over the sides. Grease well with cooking spray. Preheat your oven at 350°F.
Melt the butter and add it to a large mixing bowl. Next, add in both the granulated sugar and brown sugar. Whisk everything until the mixture is well combined.
Now, add in the egg and egg yolk one at a time, beating well between each addition. Add in the vanilla extract and instant coffee granules and whisk until the mixture is smooth and well combined.
In a medium bowl, combine all your dry ingredients together including the all-purpose flour, graham cracker crumbs, salt, and baking soda. Mix the dry ingredients until combined and then dump this dry mixture all at once into the wet ingredients.
Next, add in the marshmallows and chocolate all at once. Fold everything together until just combined and it resembles cookie dough. It’s important to fold it in gently because we don’t want to overmix. If a bit of flour is visible, that's fine.
Dump the dough into your prepared baking pan. Using your clean hands begin to press down on the down and spread it as evenly as possible in the pan. You can also use the bottom of a measuring cup if you prefer, but I just find using your hands is easier. Once you're satisfied with the evenness of the dough, you can place a few more chocolate chips and marshmallows and slightly press them in on top.
Place the pan in the oven and turn the temperature down to 325°F. Bake at 325°F for 25-30 minutes. It really depends on how hot your oven is, but I would check it at 20 minutes regardless. You want it slightly undercooked because it will continue to cook as it cools, similar to actual cookies. For me 25 minutes was perfect and then I let it cool in the pan for another 10-15 minutes. Out of the oven, it will appear puffy, but as it cools it will shrink down a bit.
Once they cool slightly, they'll set up more but they'll remain soft and chewy. Cut them into squares and enjoy them warm!