For me, what really helped was expanding the decision to cover a lot more than that first bite.

Aren't I sick of being tormented by something I actually don't want to do? So I started countering the craving with that all too familiar carb coma/digestive upset/brain fog feeling I would always get after indulging.

By making my body connect the two, it was easier for it to go, "Oh, wait, that's right, it's not just the bite -- it's what it does to me."