Sadly chickpea casserole seems to have gone, but when it was the veggie main, 7 or 8 flights out of 10, someone sitting near me would ask for it. And 6 times out of 10, multiple people would ask for it.

EDIT: Just noticed you asked specifically about breakfast. If you go for Asian Vegetarian, that is a curry, no matter what time of day (i.e. Breakfast as well. Not treid it on extended breakfast).