After I already made these and these chocolate chip cookies [CCC] I started preparing yet another recipe a few days ago. It said to refrigerate the cookie dough for up to 36 but at least 24 hours. So that's what I did, impatiently waiting for the time to pass. On several blogs I had read that these are the best ever CCC and they didn't lie. These cookies are absolutely amazingly delicious. The number one key to cookie perfection, however, is to stick with the recipe (although I slightly reduced the sugar and only used baking powder, no baking soda) and particularly the long refrigeration time is VERY IMPORTANT to get the cookies as delicious as possible!!!! You can find the recipe here.