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Delicious toasted marshmallow cookie bars topped with gooey marshmallow and chocolate

S'mores Cookie Bars

S'mores Cookie Bars combine the nostalgic flavors of classic campfire treats with the convenience of a cookie bar, making them a delightful and easy dessert option.
Prep Time 30 minutes
Cook Time 27 minutes
Total Time 57 minutes
Course Dessert
Cuisine American
Servings 16 bars
Calories 220 kcal

Ingredients
  

Crust

  • 1 1/2 cups graham cracker crumbs Crunchy and slightly sweet, the heart of your crust
  • 1/2 cup unsalted butter, melted Rich and creamy, binding it all together
  • 1/4 cup brown sugar Packed for deep sweetness

Cookie Batter

  • 1 cup brown sugar Deeply sweet and slightly caramel-like
  • 1/4 cup granulated sugar For that extra sweetness
  • 1 large egg Adds moisture and richness
  • 2 teaspoons vanilla extract Aromatic and warm, enhancing flavors
  • 1 1/4 cups all-purpose flour Providing structure to your bars
  • 1/2 teaspoon baking powder For a slight lift
  • 1/2 teaspoon salt To balance the sweetness

Toppings

  • 1 1/2 cups chocolate chips or chopped chocolate bars Luscious and creamy
  • 2 cups mini marshmallows Soft, fluffy clouds of sweetness

Instructions
 

Preparation

  • Preheat your oven to 350°F (175°C) and line an 8x8-inch baking pan with parchment paper.
  • Mix the graham cracker crumbs, melted butter, and 1/4 cup of brown sugar in a medium bowl to form a crumbly mixture.
  • Press this mixture firmly into the bottom of the baking pan to form the crust.
  • In a large bowl, beat together the remaining brown sugar, granulated sugar, and softened butter until fluffy.
  • Add the egg and vanilla extract, mixing until smooth.
  • Stir in the flour, baking powder, and salt until just combined.
  • Spread the cookie dough evenly over the graham cracker crust.
  • Sprinkle chocolate chips or chopped chocolate over the dough and gently press them in.
  • Scatter the mini marshmallows over the top.

Baking

  • Bake for 23–27 minutes, or until marshmallows are golden and cookie layer is set.
  • For extra-toasty marshmallows, optionally broil for 1–2 minutes.
  • Let cool, lift out using parchment, and slice into bars.

Notes

Enjoy warm or at room temperature. For the best experience, serve with vanilla ice cream or a glass of cold milk.
Keyword Cookie Bars, Dessert Recipe, Easy Baking, Family Treat, S'mores