You don't need to batch cook or spend hours cooking. I cook for my DC every day and it takes no time at all.
I basically choose a protein, a carb and two veg.
So protein... chicken goujons, fish fingers, sausages, grilled chicken breast, roast chicken, salmon... drizzle with olive oil, stick in oven
Carb, boil some rice, pasta, stick a potato in the microwave for a jacket potato, boil some new potatoes, cut up a potato, drizzle with oil and bake for potato wedges
Veg, boil any green or frozen veg, cut up some cucumber or peppers or stick some lettuce on a plate
Other ideas, beans on toast, egg on toast, sandwiches, sausage roll
Honestly, I cook like this every day for my DC. Takes no time at all and couldn't be easier.
Don't give them ready meals.