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S'mores cookie bars with a graham cracker base, a layer of melted chocolate bars, and toasted marshmallows on top.

S'mores Cookie Bars on a Graham Cracker Crust

Gooey s'mores cookie bars with a graham cracker base, soft cookie dough, mini marshmallows, and melted chocolate on top. Prep 10 min, bake 30 min, serves 24.
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Prep Time 10 minutes
Cook Time 30 minutes
Rest Time 30 minutes
Total Time 1 hour 10 minutes
Servings: 24 servings
Course: Dessert
Cuisine: American
Calories: 250
Ingredients Method Notes

Ingredients
  

  • 7-8 whole graham cracker sheets rectangles left intact
  • 1 cups unsalted butter 227 g, softened at room temperature (2 sticks)
  • ¾ cups granulated sugar 150 g
  • ¾ cups light brown sugar 165 g, lightly packed
  • 2 large eggs
  • 2 tsp vanilla extract
  • 3 cups all-purpose flour 360 g, stirred, spooned, and leveled
  • ¾ tsp salt
  • ¾ tsp baking soda
  • ½ cup semi-sweet chocolate chips 85 g
  • 1 cup mini marshmallows 50 g
  • 2 regular-sized Hershey's Milk Chocolate Bars two 1.55 oz/43 g bars, snapped into squares

Method
 

  1. Heat the oven to 375°F (190°C). Prepare a 13x9-inch pan by lining it with parchment paper, allowing a 2-inch overhang along the sides.
  2. Arrange graham crackers across the entire pan in a single layer, snapping them into sections where necessary for a proper fit.
  3. Using an electric mixer fitted with the paddle attachment, beat the butter with both sugars until creamy. Incorporate the eggs and vanilla. Mix, then scrape down the bowl.
  4. In a separate large bowl, whisk the flour, salt, and baking soda together. Fold the flour mixture, chocolate chips, and mini marshmallows into the butter mixture. Stir only until everything is just combined.
  5. Spread the dough evenly over the graham crackers and press it flat. Scatter additional mini marshmallows on top if desired.
  6. Bake at 375°F (190°C) for 25-30 minutes, until the top is golden brown and a toothpick inserted in the center emerges clean. If the cookie dough browns before the center finishes baking, tent it with foil.
  7. Take the pan from the oven and lay chocolate bar pieces over the top while it is still warm. Let it cool for 20-30 minutes, then lift the bars from the pan to cut and serve. NOTE: At room temperature the chocolate bars may remain quite soft and melty.

Notes

At room temperature, the chocolate bars can remain rather soft and prone to melting.