S'mores Cookie Bars

These s'mores cookie bars combine graham cookie dough, marshmallow creme, and milk chocolate into thick dessert bars that taste like a classic s'more without a campfire. They're soft, chewy, gooey in the middle, and easy to slice once completely cooled.

Course Dessert

Cuisine American

Keyword chocolate marshmallow bars, gooey s'mores bars, graham cookie dough, graham cracker cookie bars, marshmallow creme cookie bars, s'mores bars, s'mores cookie bars, summer dessert bars

Prep Time 20

Cook Time 30

Cooling: 1

Total Time 1 50

Servings to 16 bars

Calories 250kcal

Author Cathy Pollak

Equipment

baking dish 8x8 Creates thick cookie bars.
parchment paper Makes lifting the bars out of the pan easy.
mixing bowls (large and medium) For preparing the cookie dough and whisking the dry ingredients.
hand mixer or stand mixer. Creams the butter and sugars until light.
rubber spatula Folds the dough together without overmixing.
offset spatula or spoon. Helps spread the marshmallow creme evenly.

Ingredients

Graham Cookie Dough:

½ cup (113 g) unsalted butter softened
⅔ cup (145 g) packed light brown sugar
¼ cup (50 g) granulated sugar
1 large egg room temperature
1½ tsps (7.5 ml) vanilla extract
1¼ cups (150 g) all-purpose flour
¾ cup (65 g) graham cracker crumbs
¾ tsp (3 g) baking powder
¼ tsp (1.5 g) table salt
¾ cup (57 g) milk chocolate chips

Filling:

1 (7 oz / 198 g) marshmallow creme
⅓ cup (57 g) milk chocolate chips

Instructions

Preheat the oven to 350°F (177°C). Line an 8x8-inch (20 x 20 cm) baking pan with parchment paper, leaving overhang on two sides.
Beat the softened butter, brown sugar, and granulated sugar with a hand mixer for 2 to 3 minutes until light and creamy.
½ cup (113 g) unsalted butter, ⅔ cup (145 g) packed light brown sugar, ¼ cup (50 g) granulated sugar
Mix in the egg and vanilla until fully combined.
1 large egg, 1½ tsps (7.5 ml) vanilla extract
Whisk together the flour, graham cracker crumbs, baking powder, and salt in a separate bowl.
1¼ cups (150 g) all-purpose flour, ¾ cup (65 g) graham cracker crumbs, ¾ tsp (3 g) baking powder, ¼ tsp (1.5 g) table salt
Add the dry ingredients to the butter mixture and stir with a rubber spatula until a soft dough forms. Fold in the ¾ cup (128 g) milk chocolate chips.
¾ cup (57 g) milk chocolate chips
Press about two-thirds of the dough into the prepared pan. The layer will seem thin but will rise as it bakes. Lightly greased hands make it easier to press the dough evenly.
Dollop the marshmallow creme across the dough, then gently spread it into an even layer.
1 (7 oz / 198 g) marshmallow creme
Sprinkle the remaining ⅓ cup (57 g) milk chocolate chips evenly over the marshmallow layer.
⅓ cup (57 g) milk chocolate chips
Flatten pieces of the remaining dough and arrange them across the top, leaving small openings so the marshmallow can puff through while baking.
Bake for 27 to 32 minutes, or until the top is golden brown and the center is just set.
Cool completely in the pan before lifting out and slicing into bars.

Notes

Dolloping the marshmallow creme before spreading makes it much easier to cover the dough evenly.
The bottom layer of dough will look thin before baking. This is normal and creates the best cookie-to-filling ratio.
Leave openings between the pieces of dough on top so the marshmallow can toast as the bars bake.
For the cleanest slices, allow the bars to cool completely before cutting.

If you’re making this S'mores Cookie Bars, check out the full post. That’s where I keep extra tips, FAQs, and details that don’t always make it into the recipe card.

Nutrition info is an estimate and will vary depending on the brands you use.

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Nutrition