I freelance so here are my quick and easy individual ideas:
Beans on toast or egg on toast - there is NOTHING wrong with this as a meal, equally toasties are great. Making yourself something quick and nutritious is just as self-carey as a 'proper' meal.
The freezer is your friend too. I always keep packets of bagels (slice them before freezing) and mini naans. Both can be toasted from frozen and topped with something easy like cream cheese, ham, egg. My favourite lunch is a toasted mini-naan topped with a spoonful of mango chutney and a fried egg.
Stir-fried rice (packet or if you do succumb to a takeaway, save half a pack of rice for the next day) with peas and sweet corn from the freezer and a beaten egg.
If I'm pushing the boat out, chickpea curry - frozen chopped onions, sweat them off, add spices or a paste, tin of chickpeas, tin of tomatoes, simmer for 15 mins or so. Eat with a mini naan.
Pasta with pesto, or pasta with butter and cheese is also good.
I do get that pps are suggesting batch cooking, but sometimes just even thinking about cooking big pans of things is too wearing.