Go to in our house is salmon/cod fillets pan fried, broccoli, peas, new potatoes, and fried tomatoes.
Or pitta bread, prawns in garlic, coriander, chili butter, with sweet potato wedges and a salad.
With both there's not really much cooking other than a bit of boiling/frying, and minimal chopping. We're a bit fish mad here though.
If they're not seafood fans, omelette/fritatta? You could make a big one with some veg in there, whatever cheese they/you will like, and serve it with new potatoes and a side salad.
Or! Probably not as technically healthy as homemade, but I'm sick and discovered that Heinz tomato soup is not only my favourite childhood food (when sick, but also for ease!) but loads of MNers! Few tins of that, and a pile of cheese on toast! Lovely and quick, so, so tasty, and you'll be passing the Heinz tomato soup baton down through the generations. 😁