This thread is wonderful! 
I'm disabled/ chronically ill and a huge part of my life that's changed is my ability to cook. I loved to cook, have a shelf full of cookery books gathering dust in the kitchen. It's rough. This last month has been worse than most as I await pretty serious surgery.
I've found the most useful thing ever is my George Foreman grill. Steaks, chicken breasts, pork chops, fish, all cook from frozen! Once they are thawed throw on some spices/fajita mix/lemon juice whatever, packet cous cous or Batchelors rice (I 'pimp'these by adding in mushrooms, peas, chillis, chopped peppers, chorizo etc) bag of salad and you're done.
Another one is noodle soup, SO quick. Thin egg noodles in veg stock cube water, spring onions, a sliced cabbage leaf and bag of frozen king prawns. Bring the water back to the boil, add soy sauce and its done! Can also be done with finely sliced chicken but that takes longer. Serve with prawn crackers.
Aldis already cooked frikadellen meatballs work well heated in tomato sauce with spaghetti.
We use a lot of the cook in the bag type things. The cajun chicken colemans one is lovely. Add more vegetables than they say to feel virtuous. Ha.
My husband takes lunch to work, sandwiches, tuna pasta etc, he makes me whatever he's having and leaves in the fridge for my lunch.
I also find things like babybel, rice cakes, bananas, Greek yoghurts are handy to have in when I am really poorly like now. So I can just manage a trip downstairs to the fridge and grab a handful of energy and bring it back to bed to keep me going!