Melt white melts. Put the white chocolate melts in a microwavable bowl or mug and microwave for 30 seconds. Stir well and then microwave for 10 seconds at a time, stirring in between each, until the chocolate is fully melted.
Snip piping bag. Use a spoon to put the melted chocolate into a sandwich baggie. Snip a little bit off of one corner to make a hole. Pick up one of the cookies and squeeze the chocolate over the top arc of the cookie. Let harden.
Melt chocolate chips. Melt chocolate. Then put the melted chocolate into a sandwich baggie. Snip a little bit off of one corner to make a hole.
Pipe circles on cookie. Pipe three circles on each ghost cookie, 2 eyes and a mouth. Let the chocolate harden completely then store in an airtight container until ready to serve.