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hand holding a peanut butter cup s'mores bar close to the camera

Reese's Stuffed S'mores Bars

Reese's Peanut Butter Cup stuffed S'mores bars are the perfect summertime treat. A delicious graham cracker cookie bar is stuffed with a layer of peanut butter cups and a layer of marshmallow fluff. These s'mores blondies are loved by all. Step-by-step photos teach you how to bake this delicious recipe! 

  • Total Time: 50 minutes
  • Yield: 16 Brownies 1x


Units Scale
  • 4oz (1/2 Cup) Unsalted Butter, softened to room temperature
  • 50 grams (1/4 Cup) Light Brown Sugar
  • 100 grams (1/2 Cup) Granulated Sugar
  • 1 Large Egg, at room temperature
  • 2 Teaspoons Pure Vanilla Extract
  • 166 grams (1 1/3 Cups) All-Purpose/ Plain Flour
  • 100 grams (3/4 Cup) Graham Cracker Crumbs, finely crushed
  • 1 Teaspoon Baking Powder
  • 1/2 Teaspoon Salt
  • 12 Snack Size Reese's Peanut Butter Cups
  • 7oz Marshmallow Fluff/ Creme (Not melted marshmallows)


  1. Preheat oven to 350°F/180C. Line an 8-inch square baking pan with foil so it overhangs on the side (this will help you pull them out after baking) lightly grease the foil with non-stick spray then set the pan aside. 
  2. In the bowl of an electric mixer fitted with a paddle attachment or a large bowl with a handheld electric mixer beat the cream together butter and sugar until light. Make sure to scrape down the bowl to ensure everything is evenly combined. Beat in egg and vanilla. In a small bowl, whisk together flour, graham cracker crumbs, baking powder, and salt. Add the dry mixture into the wet ingredients and mix at a low speed until combined.
  3. Divide dough in half and press half of the dough into an even layer on the bottom of the prepared pan. Place the peanut butter cups on top of the dough. You just want to get it to fit in a single layer, so I break the last three in half to fit down the sides. Spread the marshmallow creme or fluff I find an angled spatula works best. Place remaining dough in a single layer on top of the fluff. I find the easiest way is to take a ball of dough and smash it between your hands to kind of make a flatter piece then lay each piece on top to fully cover the marshmallow.  
  4. Bake for 30 to 35 minutes, until lightly browned. Cool completely on a wire rack before cutting into bars.


Recipe adapted from Lovin in the Oven

  • Author: Elizabeth Waterson I Confessions of a Baking Queen
  • Prep Time: 15
  • Cook Time: 35
  • Category: Dessert
  • Method: Bake
  • Cuisine: American

Keywords: peanut butter cup s'mores bars, peanut butter marshmallow recipe

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