I'm a full time student with two kids - so I know how hectic it can get!
One thing that I do is make a huge pan of soup, any recipe, though I tend to do root vegetable (I just chop up some sweet potatoes, swede, carrots, onion, herbs, parsnips and celeriac and boil them together in some chicken stock and when they're soft enough I blend the hell out of it). It's great for a quick veggie fix. Once it's cooled I put some in the fridge and the rest i freeze in individual portions. Really good when it's cold weather, sprinkle a little cayenne or paprika to add a little kick. To make it a full meal I serve it with garlic bread.
I also make huge lasagnes and shepherds pies and use them two days running.
For a lighter meal I really love warm feta salad. Just cut some feta into cubes, about an inch square. Cover them with olive oil, garlic and some roemary and thyme, if you've got it. Cover with clingfilm and pop in the fridge for at least two hours. Then spread on a shallow baking dish, you can pop some cherry tomatoes in there too, if you like. Put it in an oven at about 180 degrees celsius (sorry, I don't know the conversion) fo about fifteen mins. If the feta hasn't browned a quick blast under the grill will sort it. Then serve in with your favourite salasy bits, I like to use mixed leaves and olives.