Make the mixture an hour before kids arrive. Once the pumpkins are shaped, refrigerate them. They'll be ready for sampling in one hour.
To make the graveyard scene shown on the cover, sprinkle a piece of styrofoam with crushed chocolate cookies crumbs. Place coconut and green food color in a resealable plastic bag; seal and shake to make "grass." Turn to p.4 to make Hot Dog Mummies.