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Best S'mores Cookie Bars
Prep Time
15 mins
Cook Time
25 mins
Total Time
40 mins
Course: Dessert
Cuisine: American
Keyword: how to make s'mores bars, peanut butter s'mores bars, s'mores bars, s'mores cookie bars
Servings: 16 bars
Calories: 268 kcal
Author: Sabine Venier
  • 1/2 cup unsalted butter, melted (113g)
  • 1/2 cup light brown sugar, packed (100g)
  • 1 large egg
  • 1 1/4 cups all-purpose flour, spooned and leveled (150g)
  • 3/4 cup graham cracker crumbs (72g)
  • 3/4 tsp baking powder
  • 1/2 tsp salt
  • 1/2 cup creamy peanut butter - optional (62g)
  • 5 Hershey's or Lindt milk chocolate bars (7.75oz / 220g)
  • 1 jar marshmallow fluff (7.5oz / 212g)
  1. Preheat the oven to 350°F (175°C). Line an 8x8 inch (20x20 cm) or 9x9 inch (23x23 cm) baking dish with parchment paper and set aside. 

  2. In a large mixing bowl, using a handheld or stand mixer fitted with a whisk or paddle attachment, mix butter and sugar on medium speed just until combined for about 1 minute. Add the egg and mix just until combined. Mix in flour, graham cracker crumbs, baking powder, and salt just until incorporated.

  3. Divide cookie dough in half. Transfer one half of the dough to the prepared pan and press into the bottom of the pan evenly. Lift out the dough layer with the parchment paper and set aside. This will be your top cookie dough layer.

  4. Line the baking pan again with parchment paper and press the remaining cookie dough into the bottom of the pan evenly. Spread the peanut butter evenly on top if used. Then place the chocolate bars in a single layer on top and spread the marshmallow fluff evenly on top. Place the top cookie dough layer on top and carefully press into the pan to even.

  5. Bake for about 24-26 minutes when using a 9x9 inch baking pan or for 26-28 minutes when using an 8x8 inch baking pan or until golden brown. Let the bars cool to room temperature before cutting. Store leftovers in an airtight container at room temperature up to 3 days. 

Recipe Video



  • Replace regular graham crackers for chocolate flavored graham crackers
  • Substitute chocolate bars for full sized peanut butter cups
  • Instead of using peanut butter, use Nutella spread


Additional Flavors

  • Add 1 cup (175g) peanut butter chips. 
  • Sprinkle in 1/2 cup (63g) of peanuts, walnuts, or pecans on top of peanut butter layer. 



  • I recommend allowing the s'mores bars to completely cool before cutting because otherwise, they will not cut well. 
  • Use high-quality chocolate for this cookie bar recipe. Lindt and Hershey's are my favorites.
  • Do not overmix the cookie batter for these s'mores bars. 
Nutrition Facts
Best S'mores Cookie Bars
Amount Per Serving
Calories 268 Calories from Fat 117
% Daily Value*
Fat 13g20%
Saturated Fat 6g30%
Cholesterol 28mg9%
Sodium 196mg8%
Potassium 133mg4%
Carbohydrates 35g12%
Fiber 1g4%
Sugar 21g23%
Protein 4g8%
Vitamin A 195IU4%
Calcium 30mg3%
Iron 1.2mg7%
* Percent Daily Values are based on a 2000 calorie diet.