Place 24 Ritz crackers on a large baking sheet. With a knife, spread a layer of marshmallow fluff on each cracker. Then place another cracker on top to create a sandwich cookie.

Place the chocolate bark in a microwave-safe bowl and heat in the microwave until entirely melted. About 1-2 minutes or so. Dip the cracker sandwich in the melted chocolate, using a fork to turn it over and get it fully covered. Then place back on the baking sheet. Repeat with all the cookies.

Sprinkle graham cracker crumbs over the top of each cookie.

Then place in the refrigerator to chill for 20-30 minutes to let the chocolate harden. Store in an air-tight container.