Melted chocolate chips in a microwave safe bowl for 1 minute on 50% power. Stir them. If they still need to be melted, do it at 30 second intervals at 50% power until completely melted.
Spread a thick layer of marshmallow fluff over the top of a square of graham cracker.
Dip the marshmallow side into the chocolate chips and turn until the chocolate stops dripping. Place on a piece of parchment paper to dry.
Sprinkle with nuts, sprinkles or whatever else you can think of.
Once all graham crackers have been dipped and covered in sprinkles, put in the freezer for an hour to dry the chocolate.