I started doing incalls only recently. I have some food allergies, so I cannot just go to shop and grab first thing that I would like to eat.
That's why I usually took some food with me, packed lunch. Recently I only take some snacks and then go to eat whenever I can (I google places nearby that would be good for me and then I go there, that's how I saw some time not to wandering around, looking where to eat)
So for packed lunch I usually make some kind of pancakes or waffles, they are easy for me to eat even cold. I also sometimes boil some eggs and take some cherry tomatoes, snpinach, etc.
If I do not have time to make something, I buy fallafels, homous, I buy cherry tomatoes and sometimes cut some carrot sticks to eat with it.
For snacks I always have some energy bars for a quick snack, I have some fruits, sometimes nuts or yoghurt, etc.
Recently I found out how to make wonderfull breakfast. I put oats in a plastic box, then put some add-ons: raisins, chia seeds, cinammon, goji berries, etc. and then I store it in that box. In the morning I only need to fill it with hot water, wait 5-10mins and then I can eat it! If I have berries or nuts, I put them in that oatmeal too