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An image of s'mores bars topped with Hershey's chocolate squares and toasted marshmallows.
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4.71 from 120 votes

S'mores Bars

These S’mores Bars are the ultimate mashup of classic campfire s’mores and cookie bars. Ready in under an hour, these bars are easy to share with a crowd and will disappear in seconds!
Prep Time15 minutes
Cook Time35 minutes
Total Time50 minutes
Course: Dessert
Cuisine: American
Servings: 18 squares
Author: Amy Nash

Ingredients

Graham cracker crust

  • 2 1/4 cups graham crackers (1 1/2 sleeves, crushed)
  • 2/3 cup salted butter melted
  • 1/3 cup granulated sugar

Cookie top

  • 1 cup salted butter softened
  • 3/4 cup granulated sugar (150g)
  • 3/4 cup packed brown sugar (150g)
  • 2 large eggs
  • 1 teaspoon vanilla
  • 2 1/4 cups all-purpose flour scooped and leveled (317g)
  • 1 teaspoon salt
  • 1 teaspoon baking soda
  • 3 cups miniature marshmallows divided
  • 1 cup semi-sweet chocolate chips
  • 3 Hershey bars broken up

Instructions

  • Preheat the oven to 350°F. In a medium bowl, mix together the graham cracker crumbs, melted butter, and sugar using a fork, then press the crumb mixture into the bottom of a 13×9-inch rectangular greased baking dish. Bake for 7 minutes, then remove from oven and allow to cool slightly.
    2 1/4 cups graham crackers, 2/3 cup salted butter, 1/3 cup granulated sugar
  • Meanwhile, cream the butter and sugars together. Add in eggs and vanilla and beat well until light and creamy. Stir in flour, salt and baking soda just until combined. Then mix in the chocolate chips and 2 cups of the marshmallows by hand.
    1 cup salted butter, 3/4 cup granulated sugar, 3/4 cup packed brown sugar, 2 large eggs, 1 teaspoon vanilla, 2 1/4 cups all-purpose flour, 1 teaspoon salt, 1 teaspoon baking soda, 3 cups miniature marshmallows, 1 cup semi-sweet chocolate chips
  • Carefully spread cookie mixture over the graham cracker crust by dropping spoonfuls of batter evenly around the dish and then gently pressing it together so you aren't disturbing the graham cracker crust beneath.
  • Bake for 18 minutes at 350°F, then quickly remove from the oven, top with broken pieces of Hershey Bars and sprinkle with remaining 1 cup marshmallows. Return to oven to finish baking. Bake 9-11 minutes more, until golden brown on top. The center should be mostly set but still just a little undercooked. Don't overcook - you want to eat these just a little on a the gooey side, trust me.
    3 Hershey bars
  • Remove and allow to cool completely before cutting and serving.

Video

Notes

I will sometimes sprinkle the bars with a handful of chocolate chips after removing them from the oven. The bars don't need that extra bit of chocolate, but I think it makes them look extra attractive. It's a total vanity move, but I recommend it!
Storage: 
  • Store in an airtight container on the counter for 4-5 days. Layer them with a piece of parchment paper or waxed paper to keep them from sticking.
  • You can also freeze the s’mores bars for up to 2 months in an airtight container in the freezer. Let them thaw on the counter for 3-4 hours before serving. You might even want to warm them in the microwave for a few seconds to freshen them up a bit too.
  • It's easy to make these bars ahead of time. Make sure they are stored airtight to keep their chew.

Nutrition

Calories: 513kcal | Carbohydrates: 64g | Protein: 5g | Fat: 28g | Saturated Fat: 17g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 8g | Trans Fat: 1g | Cholesterol: 64mg | Sodium: 434mg | Potassium: 167mg | Fiber: 3g | Sugar: 41g | Vitamin A: 557IU | Calcium: 37mg | Iron: 2mg

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