Combine frosting mix, corn syrup, vanilla, and boiling water in a large mixing bowl; beat at high speed with an electric mixer until stiff peaks form. Gradually add powdered sugar, beating at very low speed. Mixture may be too stiff for some mixers (like mine!), so beat by hand if necessary.

Spoon into a decorating bag fitted with a large round tip, or a heavy-duty, zip-top plastic bag (snip a hole in the corner of the bag).

Pipe ghost shapes on wax paper lined baking sheets; smooth surface of candy with a wet finger. Press 2 chocolate mini morsels for the eyes and one chocolate morsel for the mouth into the ghost.

Let ghosts stand 2 to 3 hours or until candy feels firm. Carefully turn candy over, and let stand 12 hours or until dry. Store in airtight containers.