Preheat the oven to 400 degrees F.
Lay 1/2 of the graham crackers on a cookie sheet. Top with chocolate pieces to cover. Use kitchen scissors to snip the marshmallows in 1/2 horizontally if using miniature crackers and place 1/2 a marshmallow on top of each graham cracker. If using regular size crackers use a whole marshmallow.
Bake until the marshmallows are puffed and golden brown, about 3 to 5 minutes. Remove from the oven and top with the remaining graham crackers, pressing down slightly to make a sandwich. Serve immediately, while still warm.
