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A person with pink nail polish holds one of several sliced cookie bars on a wooden board. The bars, resembling Reeses Smores, sport a golden brown crust with swirls of white marshmallow throughout. A diagonally placed cloth with a black grid pattern is partially visible.
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Reese's S'mores Bars - The Best Peanut Butter S'mores Bar Recipe

Reese’s s’mores are the ultimate treat. The melty chocolate, toasted marshmallows, and that irresistible peanut butter combo are insanely good. You’ve got to try this quick, easy, and delicious dessert!
Prep Time10 minutes
Cook Time25 minutes
Total Time35 minutes
Servings: 16 bars
Calories: 232kcal
Author: Melissa Griffiths

Ingredients 

  • ½ cup butter, softened
  • ¼ cup packed brown sugar
  • ½ cup sugar
  • 1 egg
  • 1 teaspoon vanilla
  • 11/4 cups flour
  • 1 teaspoon baking powder
  • ¼ teaspoon salt
  • 6 graham crackers, crushed into crumbs
  • 9-12 regular sized Reese’s Cups, or the equivalent if using fun-sized
  • cup chocolate chips, semi-sweet or milk
  • 1 (7- ounce) container marshmallow creme

Instructions

  • Preheat the oven to 350°. Line an 9-inch square baking pan with foil (let the foil hang over all the edges so that you can use it to pull the bars out of the pan later) and grease the foil well.
  • To make the dough combine the butter and sugar in a large bowl and beat until light in color and fluffy, about 3 minutes. Add the egg and vanilla and beat to combine. Add the flour and stir until well combined. Stir in the graham cracker crumbs.
  • Press ⅔ of the dough into the bottom of the baking dish. unwrap and place Reese’s Cups evenly over the dough, sprinkle the chocolate chips evenly over the Reese’s (letting them fall into the cracks), and then carefully spread the whole container of marshmallow creme over the chocolate. Then gently press the remaining dough evenly over the marshmallow creme.
  • Bake for 25 minutes until the crust starts to turn golden brown. Remove from the oven and allow the bars to cook for an hour in the pan. After an hour use the edges of the foil to remove the bars from the pan. Let the bars cool on a wire rack (in the foil) out of the pan until set (this will take a couple of hours).
  • To cut the bars use a sharp knife and clean it in between each cut. These are sticky! I had to stick my bars in the fridge for an hour before cutting.

Notes

  • Add a drizzle of melted chocolate, a sprinkle of sea salt, or even crushed nuts for an extra layer of flavor and texture.
  • Mini Reese’s cups are easier to layer and distribute evenly, ensuring every bite has that perfect peanut butter-chocolate balance.
  • For that perfect golden-brown finish, keep a close eye on them in the oven or over the campfire—they can go from perfectly toasted to burnt in seconds!
  • Don't skip the foil lining step! Make sure it extends over the edges of your pan by at least 2 inches. This creates handles that make removing the bars a breeze and prevents any sticky marshmallow from cementing your dessert to the pan.

Nutrition

Calories: 232kcal | Carbohydrates: 40g | Protein: 4g | Fat: 6g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Cholesterol: 1mg | Sodium: 406mg | Potassium: 97mg | Fiber: 2g | Sugar: 18g | Vitamin A: 13IU | Vitamin C: 0.001mg | Calcium: 95mg | Iron: 2mg