#30daysofcookies. Shabby chic party dress cookie. A top tip for decorating cookies is to use edible icing sheets if you are not confident using royal icing to achieve a smooth covering. You can print any pattern you like on the icing sheet, using a printer with edible ink, or you can buy pre-made printed sheets. Simply use a cookie cutter to cut out the edible icing sheet, then attach it to the top of the cookie using piping gel or boiled apricot jam.