Personally do mass cooking, picking up ingredients either from a farm shop or if I'm short on time from one of the veggie box schemes.
Started off with big chillis and curries, making 6 times the amount I would normally do and freezing the rest. Now also do pastas and soups. I make sure to give some extra sauce as well as try not to use a microwave for the reheating. A meal is as simple as getting out of the freeze the night before and reheating whilst I surf the web.
Breakfast:have scrambled eggs on brown toast with an orange.
Snacks: fruit or peanuts.
Healthy food every day and it's quicker and cheaper then cooking properly every day.