What about buying a large slow cooker? It would hold quite a lot - one meal to eat that day and a couple of others to freeze.
I make the basics, casseroles with vegetables which can be frozen, you can cook large quantities of veggie mince which can then have other ingredients added when defrosted to make chilli con carne, spaghetti bolognaise, other ingredients for pies etc and keep the pasty separate in the freezer so that the pie filling can be defrosted and the pastry added before going into the oven.
Serve these meals with pasta, rice or a jacket potato which are quick and easy. We have always had fresh veg but recently, needing to fill up a new freezer, I bought frozen veg and it is fine.
I wouldn't pre-cook fish as it is so quick and easy.
Mother of the Groom outfit woes