I convinced myself that the first cookie was OK because "I was being a good Mummy and checking out how he had done".
Second one "This isn't good but they are yummy".
Third one "What am I doing? Surely one would have been plenty".
Fourth one "Oh yeah, I am meant to be thinking about this and working out why. OK, I am in a bad mood, I am annoyed and there is nothing I can do about it. So I have eaten these instead.".
At that point I still had half a cookie left in my hand. I stood there staring at the cookie. Then I threw it in the bin. My frustration hasn't eased any, I am still really angry but I have only made it 3 1/2 cookies worse rather than an entire tray full.
I can still salvage today by replacing part of my tea with salad and still making sure I get a decent healthy meal. I have work to do on this. A lot of work. But I will get there.