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S’mores Cookie Bars

smores cookie bars - featured image

These gooey s’mores cookie bars combine a buttery graham cracker cookie base, melty chocolate, and toasted marshmallows for the ultimate nostalgic dessert—no campfire required. Perfect for parties, bake sales, or a cozy night in, they’re easy to make and impossible to resist.

Ingredients

Scale
  • 1 cup (226g) unsalted butter, softened
  • 1 cup (200g) light brown sugar, packed
  • 1/2 cup (100g) granulated sugar
  • 2 large eggs, room temperature
  • 2 teaspoons pure vanilla extract
  • 2 1/2 cups (320g) all-purpose flour
  • 1 1/2 cups (150g) graham cracker crumbs (about 12 full sheets, crushed finely)
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 1/2 cups (255g) semi-sweet chocolate chips
  • 2 full-size (90g each) milk chocolate bars, chopped
  • 3 cups (150g) mini marshmallows

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13-inch pan with parchment paper or coat with nonstick spray.
  2. In a large bowl, beat together butter, brown sugar, and granulated sugar until light and fluffy (about 2–3 minutes).
  3. Beat in eggs, one at a time, then stir in vanilla extract.
  4. In a separate bowl, whisk together flour, graham cracker crumbs, baking soda, and salt.
  5. Gradually add the dry ingredients to the wet mixture, mixing just until combined.
  6. Scoop about 2/3 of the dough into the prepared pan and press into an even layer.
  7. Sprinkle chocolate chips and chopped milk chocolate bars evenly over the dough.
  8. Sprinkle 2 cups of mini marshmallows over the chocolate layer, reserving 1 cup for later.
  9. Drop spoonfuls of the remaining dough over the marshmallows (it won’t cover completely).
  10. Bake for 22–25 minutes, until the top is golden and set but the center is still a bit soft. At the 18-minute mark, sprinkle the remaining marshmallows on top.
  11. Let the bars cool in the pan for at least 1 hour before lifting out and slicing into squares.

Notes

For extra gooey bars, avoid overbaking and let them cool before slicing. Use parchment for easy removal. To toast marshmallows more, broil for 1–2 minutes at the end, watching closely. Bars can be made gluten-free or dairy-free with simple swaps. Store in an airtight container for up to 3 days or freeze for up to 2 months.

Nutrition

Keywords: s'mores, cookie bars, dessert, easy, chocolate, marshmallow, graham cracker, bake sale, party, gooey, nostalgic, summer, kid-friendly