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A stack of gooey S'mores Cookie Bars with toasted marshmallows and melted chocolate layers.
Print Recipe

S'mores Cookie Bars

Prep Time20 minutes
Cook Time30 minutes
Total Time50 minutes
Servings: 16 servings
Calories: 320kcal

Ingredients

  • 1/2 cup unsalted butter, softened
  • 3/4 cup granulated sugar
  • 1 large egg , room temperature
  • 1 teaspoon vanilla extract
  • 1 1/3 cups all -purpose flour
  • 3/4 cup graham cracker crumbs
  • 1 teaspoon baking powder
  • 1/4 teaspoon sal t
  • 2 cups mini marshmallows
  • 7 ounces milk chocolate bars, broken into pieces

Instructions

  • Preheat oven to 350°F (175°C) and line an 8x8 inch baking pan with parchment paper.
  • In a large bowl, cream the softened butter and granulated sugar together until light and fluffy.
  • Add the egg and vanilla extract, beating until well combined.
  • In a separate bowl, whisk together the flour, graham cracker crumbs, baking powder, and salt.
  • Gradually mix the dry ingredients into the butter mixture until a thick dough forms.
  • Press half of the cookie dough into the bottom of the prepared baking pan in an even layer.
  • Place the chocolate bar pieces over the dough layer, followed by an even layer of mini marshmallows.
  • Flatten the remaining dough into small sections and place them over the marshmallow layer, pressing gently.
  • Bake for 30 to 35 minutes or until the top is golden brown.
  • Allow the bars to cool completely in the pan before cutting into 16 squares.