I tested this recipe with Jolly Ranchers, Life Savers, Dum Dums and Charms lollipops. All of those worked except the Life Savers. They didn't seem to melt as well as the others and left me with kind of a lumpy result. And of course, if you're going to use a lollipop, you will need to break the candy up to remove the stick before adding to the cookie! You can also experiment with other types of hard candy that you like! If you want to be extra cautious, you can bake off one cookie and see how the results are before making the rest of the batch. You will need between one and two small candies per cookie, depending on the size of your cutout and the size of the candy.