We just have whatever is leftover from the dinner the day before. Usually curry, soup, stew, shepherd's pie, Bolognase, chilli. I dont send in rice or pasta. So soups/stew they will have a slice of bread and butter, curry a naan or poppadoms, chilli tortilla chips, Bolognase some grated cheese.
Another easy alternative is couscous, crumble up a stock cube over couscous, mix up and pour over the hot water, cover the bowl with a plate. Then chop up some veg eg spring onions, pepper, tomatoes, cucumber, sweetcorn. Could add some meat like ham or chicken too. Mix it up and tastes great warm or cold. Takes less than 10 mins to cook and prep.
Cooked frankfurters or sausage in the thermos. Then give them a finger roll to make a hot dog.
A mini cooked breakfast, beans, sausage, hash brown, mushrooms. Then maybe a boiled egg. I keep meaning to do this, it's my ideal meal!! Love a fry up!!