Do you eat yoghurt? If so, that’s a great breakfast with some fruit and/or nuts. I find it just as filling as the cereals I used to eat and it’s not exactly a hassle to prepare.
Bread is trickier to give up, I think, as it’s so handy for a quick meal. Gram flour flatbreads are the best alternative I’ve found. They aren’t really like bread at all – more like pancakes, but they’re helping me not to miss bread so much. Good with curry instead of Naan or rice. They’re also good as wraps instead of a sandwich.