I'm an omivore but when I was growing up the phrase, "they eat meat every day" was used to mean a family was quite well off.
I think we have seen more ultra processed food and not most people can afford to eat meat every day and some of the vegi things we used to have we don't think about today.
If you watch Shirley Valentine, "chips and egg" is mentioned a couple of times, it used to be a fairly common evening meal for me as was beans on toast.
Sorry I know that isn't vegan, I hope you do not mind that on a vegan thread.
OK back to breakfast idea.
Indian breads, puris, parathas, dohsas, on their own or with chutney. Paratha can be stuffed with veg.
My aunt is lactose intolerant, she make a batch of kedgeree and freezes in microwavable pots. A spiced rice without the fish would work well.
Japanese breakfast often has rice, either warm or chilled with things like spring onion, also various rice balls with different fillings.