When pressed for time or getting home late I have done these with success:
Irish Stew (chunky canned soup) with a microwaved cut potato added, plus an onion.

Aside from softening/heating the potato, the heating of the soup is almost set-and-forget, leaves just one thing to clean plus your bowl (unless you want to eat it 'cowboy style').



That's obviously a winter option and the soups are great for taking in leftovers like veg or meats in the fridge.

Good suggestions in the posts above, about pre-cooking some meats for use over three days.

Keeping it basic and fresh usually means a satisfying meal. Not necessarily with lots of time, effort or cleaning. Possibly a lot fewer calories, additives and fats than eating fast food, too.