Turn the oven on broil. Line a large sheet pan with parchment paper. Place 20 graham cracker squares on the baking sheet. Then place a chocolate square on each graham cracker. Add one marshmallow to each stack.
Place the sheet pan on the center rack of the oven. Broil the marshmallows for 1-2 minutes. Do not take your eyes off the marshmallows...they can burn fast!
Once the marshmallows are toasted to your liking, remove the pan and press another graham cracker square down on each stack. Enjoy!
Mix things up! Try making your s'mores with Ritz butter crackers, dark chocolate and salted caramel sauce.