If you leave the dough in the refrigerator too long and dough becomes hard, just microwave it for a few seconds. I use a melon baller to help keep a uniform size. I also leave the cookie on the cookie sheet for about 2 minutes so the mint candy will soften. I remove the cookie to a counter top spread with paper towel and use a small spatula to spread the mint. Bake for 12-13 minutes!