These delicious brownie s'mores let you enjoy the popular campfire treat on top of a brownie. I consider myself a gourmet cook and originally thought these would just appeal to kids, but everyone loves them!
Gather the ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.\
Make the brownies: Stir brownie mix, oil, eggs, and water together in a medium bowl until well blended. Pour batter into the prepared pan. Bake in the preheated oven for 15 minutes.
While the brownies are baking, make the topping: Break graham crackers into 1-inch pieces and place into a bowl. Add marshmallows and chopped chocolate and toss to combine.