Break the graham cracker sheets in half. Lay out 6 graham cracker halves on a baking sheet. Place a square of chocolate on the crackers. Top with a marshmallow.
Place the pan under the broiler and broil until the marshmallows are golden and melty inside.
Top each marshmallow with a second cracker.
Switch out the milk chocolate for another chocolate. Dark chocolate will certainly mix things up as will Reese's Peanut Butter Cups or Heath Bars for a unique twist. Be creative and try several different options to find your favorite.
Add a spread. Nutella, caramel sauce, jam, jelly, lemon curd, or a nut or seed butter are fun to slather on the second cracker before topping it all off. Try it without the chocolate, for another kind of flavor!
Change the cracker. Digestives (the British alternative to the graham cracker) are a great swap as are whole wheat crackers, chocolate graham crackers, saltines, and even vanilla wafers. You can even use thin cookies to make these tasty sandwiches.