Burritos. Microwave rice, those lentil pouches mixed with fajita spices or cooked chicken, wraps, ready grated cheese, salsa/guacamole pots. Or quesadillas - sandwich wraps together with cheese, salsa, any deli meat you have etc. I make soups too, which sounds like a strange priority but a bowlful of real veg is so much better for you than bought soups I think, and the blender does most of the work.
4 times a day put a timer on your phone for 12 minutes and rest. Lie down, phone down, close your eyes, play a meditation track on Spotify or whale song, rainforest noises, whatever works for you. 4 times a day whether you need it or not. First one should be early, before 10am. The most useful thing I learned from fatigue clinic.
If there are days you need to do a lot, schedule extra rests in before and after. After a busy day have a "nothing" day - you will get much more done over the week as a whole.
Fly lady home blessing hour is a good first base for minimal housework. Take 5 mins each day putting things away and try to do 10 mins each of about 6 tasks, spread through the week as much as you like. My baseline is max 10 mins each of vacuuming, spray mop, dust main living area, main sink and loo, empty bins, wipe kitchen surface & clean sink. On a better week I do a 2 hour getting ready for visitors checklist. Neither of these is good at getting to the heavy underlying cleaning but something. is better than nothing.