How about a quiche - takes 5 seconds to whip the eggs & throw in whatever ingredients you want. (ham, cheese, tomato, mushroom, shallots etc).
It usually takes less than 10 minutes to make... and then about 40 mins to cook in the oven, but that leaves you free to do baths/homework etc etc.
I usually serve it with a salad or those little Pomme Noisettes (sp?!) - the potato balls a little like potato gems

Another one is napolitana pasta (a few tins of crushed tomatoes, onion, fresh garlic, parsley, basil, rosemary, a splash of red wine & a spoon of tomato paste.)
I also add chilli to mine.
I just serve with fresh bread rolls or bread in the oven which takes about 10 mins.