Melt the butter in a pan and add the marshmallows. Keep stirring until melted.
Refrigerate 1 hour. Once hardened, cut the treats into graham cracker sized squares. Cut each square in half width-wise to create two squares.
Crush the graham crackers by hand, or pulse in a food processor to create crumbs.
Melt the chocolate chips in a saucepan or microwave. Spread chocolate on top of of one square, sprinkle on the graham cracker crumbs, and top with another rice crispy square. Repeat for all the treats.
Spread melted chocolate on top of each s'mores rice crispy treat and decorate with more graham cracker crumbs and mini marshmallows, if desired.