Melt the chocolate in a bowl over a pan of simmering water. Meanwhile, crush the biscuits and Maltesers in a large bowl with a rolling pin.
Add mini marshmallows, dried cranberries and cake crumbs, then the chocolate and golden syrup. Mix well. Tip desiccated coconut onto a plate. Drop large spoonfuls of mixture onto the plate, then roll them around, coating in coconut and shaping into balls. Place on a baking tray and chill for 30 mins before serving. Sprinkle with edible glitter if you like.