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S’mores Cookie Bars Recipe: Gooey Chocolate, Graham & Marshmallow

small stack of s'mores cookie bars on wire rack with mini marshmallows and chocolate

These S’mores Cookie Bars are soft, chewy, and packed with gooey marshmallows, melty milk chocolate, and buttery graham cracker crumbs. This big-batch pan delivers all the classic s’mores flavors in an easy, crowd-pleasing dessert.

Summer calls for s’mores, and these cookie bars are an effortless way to enjoy that campfire taste without the fire. They’re quick to prepare and perfect for warm-weather get-togethers, potlucks, or simply when you crave a nostalgic treat.

closeup of a s'mores cookie bar on a black wire rack

The recipe uses a simple cookie dough base enriched with graham cracker crumbs to evoke that signature s’mores flavor. Mini marshmallows get folded into the dough, with extra marshmallows added on top near the end of baking so they toast slightly and become perfectly gooey. Milk chocolate chips and broken fun-size Hershey bars create molten pockets of chocolate throughout the bars.

stack of s'mores cookie bars with marshmallows and hershey bars on wire rack

These bars bake in a 13×9 pan and slice into generous squares. They’re excellent warm, when the marshmallows and chocolate are at their gooey best, but they also hold up well after cooling, making them a flexible dessert for any occasion.

author holding a s'mores cookie bar

smores cookie bars on wire rack
5 from 3 votes

S’mores Cookie Bars

These S’mores Cookie Bars capture summer in every bite: soft, chewy bars loaded with marshmallows, milk chocolate, and graham cracker crumbs.
Prep Time
10 mins
Cook Time
30 mins
Total Time
40 mins
Course: Bars, Dessert
Cuisine: American, Dessert
Servings: 15

Ingredients

  • 12 Tablespoons (1 & 1/2 sticks) unsalted butter, softened to room temperature
  • 1 cup brown sugar
  • 1/2 cup granulated white sugar
  • 1 large egg
  • 1 large egg yolk
  • 1 Tablespoon vanilla extract
  • 1 tsp baking soda
  • 2 tsp cornstarch
  • 1/4 tsp salt
  • 1½ cups all-purpose flour
  • 1/2 cup graham cracker crumbs
  • 2 cups miniature marshmallows, divided
  • 1 cup milk chocolate chips
  • 4 fun size Hershey bars, broken up

Instructions

  • Preheat oven to 350°F. Line a 13×9 light metal baking pan with foil, letting the foil extend over the pan edges, and spray the foil with cooking spray. Using foil or parchment helps contain any melted marshmallow.
  • In a stand mixer fitted with the paddle attachment, cream together the softened butter and both sugars until light and fluffy, about 1 minute. Add the egg and beat well, then add the egg yolk and vanilla, beating after each addition. Add baking soda, cornstarch, salt, flour, and graham cracker crumbs and mix until combined. Fold in 1½ cups of the miniature marshmallows and the milk chocolate chips.
  • Press the dough evenly into the prepared pan. Scatter the broken Hershey bar pieces across the top. Bake for 20 minutes, then remove from the oven but keep the oven on. Sprinkle the remaining 1/2 cup miniature marshmallows over the bars and return to the oven for another 5–10 minutes, until the bars are light golden, set, and the marshmallows are slightly toasted. Cool completely before cutting into squares.

Notes

For best flavor, try using quality milk chocolate chips such as Guittard or Ghirardelli.

close up of s'mores cookie bar on a wire rack with marshmallow

These irresistible s’mores bars are a guaranteed hit—soft, chocolatey, and full of toasted marshmallow goodness.

S'mores Cookie Bars photo collage with text

Have a super sweet day!

xo, Hayley