Break the graham crackers into 4 small rectangles.
Snuggle them up close to each other on the pan.
Distribute the chocolate chips and marshmallows evenly on top of the graham crackers.
Put the pan under the broiler about 6-inches from the heat. Broil until the marshmallows get puffy and look light brown. Watch carefully so the s'mores don't burn. Carefully remove the pan out from under the broiler.