Easy Fudge S’mores Brownies

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Grab a box of brownie mix and make these Easy Fudge S’mores Brownies! Made with graham crackers, a rich fudge brownie, mini marshmallows, and chopped up Hershey’s chocolate bars, these s’mores brownies are decadent, delicious, and will satisfy all your s’mores cravings. 


Units Scale
  • 1 18.3 oz package fudge brownie mix (I use Betty Crocker, but any kind will work)
  • 1/4 cup milk or water
  • 2/3 cup vegetable, canola, or light olive oil
  • 2 large eggs
  • 9 whole graham crackers, broken in half (18 pieces total)
  • 2/3 cup semi-sweet chocolate chips
  • 1 cup mini marshmallows (more or less, depending on preference)
  • 1 Hershey’s milk chocolate bar, chopped


  • Preheat the oven to 325° F and line an 8×8 baking pan with parchment paper, leaving an overhang on the sides.
  • Next, place 9 graham cracker halves and 6 quarter pieces (for a total of 15) into the bottom of the pan, overlapping slightly if needed. Set aside remaining graham crackers for later.
  • In a large glass mixing bowl, combine the brownie mix, water, oil, and eggs until blended. Do not overmix.
  • Stir in 2/3 cup of semi-sweet chocolate chips and pour batter over the graham crackers in the pan.
  • Bake for 45-50 minutes or until a wooden toothpick comes out slightly sticky. The brownies will continue to cook slightly while cooling.
  • While brownies are baking, break the remaining graham cracker halves into small pieces, and chop up Hershey’s bar.
  • Once brownies have baked, remove from oven, and sprinkle the top of the brownies evenly with the mini marshmallows and graham cracker pieces. While preparing, preheat the oven broiler.
  • Place in the oven and broil until the marshmallows are a light golden brown and toasty. Make sure you watch carefully as, they can brown very quickly and you don’t want the marshmallows to burn.
  • Remove from the oven and place on a wire cooling rack. Immediately top with the chopped up Hershey’s chocolate bar and let brownies cool for 1 hour at room temperature.
  • Once cooled, lift out the brownies and place on a cutting board to cut into 9 even brownie slices (or 12 smaller slices, if desired). I recommend using this knife for the cleanest cuts possible.
YouTube video


To Store: Let the brownies cool completely before cutting and storing in an airtight container at room temperature. These brownies will remain fresh for up to 3 days, but are best enjoyed the same day.

To Re-Heat:  Place in the microwave and heat for 15-20 seconds or until warm.