Hi Mario,
Sorry to be the one to tell you this, but you just need to find (or make) your own cookies! No cheating, or you just cause damage all over again. I believe it is something like a gram(or maybe less) of gluten a day causes damage. Not to mention, that most people experience horrible pain and symptoms once being gluten-free for a while. Your body becomes ultra sensitive to the gluten, because it likes being gluten free. So when you want to cheat at parties, even once a year, you may very well suffer for it for weeks afterwards. Now you will have to be the judge of whether it is worth it or not, but most people will agree it is not worth it. You will start to find the gluten-free diet is not as hard after a while and being gluten-free will become second nature. But it is very normal to feel sorry for yourself every once in a while and grieve for your loss of freedom to eat whatever you feel like. Just don't let it keep you down. You will eventually be healthier than you probably ever remember feeling in your life, and for that you should be very happy!
Gluten intolerance and the gluten free diet can make us all feel a full range of emotions. These are just a few of them.
So just go easy on yourself and you will find it will not be so hard down the line.
God bless,
Mariann