Melt the chocolate wafers according to package directions. Cover the ice cream cone with chocolate, using a spatula to smooth and remove any excess chocolate.
Decorate the cones with sprinkles and place on a parchment covered baking sheet.
Add a small amount of chocolate to the bottom edge of the cone to adhere the green sour belts. Optional: add a black cat icing decoration to the front.
Fill the cones with Halloween candy and sprinkles. Cover the bottom of the cone with chocolate, being careful not to drop chocolate inside the cone. Then place a chocolate cookie on top. Flip the cone over and let the chocolate set before transferring to an airtight container until ready to eat.