Gently press the Hershey's Kisses or Hugs onto the cookies immediately after the cookies come out of the oven. Take care not to press the Kiss or Hug all the way through the cookies. Let the cookies rest on the baking sheet for 3 minutes, then transfer them to a wire cooling rack to cool completely. The chocolate candy will get very soft and can take up to 1-2 hours harden again. You can speed up this process by placing the cookies in the refrigerator or freezer.