We have periods when we are shockingly bad, some when we are angelic, and mostly a middle of the range time.
I used to do a roast dinner on a Sunday, but DD won't eat those anymore. But it is a good time to do a decent meal as I have time, and I generally do a dinner for Monday while I am at it.
So this week, the spag bol sauce is made on the cooker, with enough for 2 more portions for freezer, and all DH has to do tonight is heat it up and cook the pasta.
Other good "Monday dinners" include curries like Lamb Rogan Josh or Chicken Bhuna, or Chilli con carne (or vegetarian chilli). Shepherds pie, smoked haddock and broccoli pie, or lasagna are all good to put in the oven on the timer.
The second half of those dinners is always frozen, and used again in the middle of the next couple of weeks (usually not the same week so we don't get bored).
Tuesday, I will often have a traditional "meat and 2 veg" type dinner. Meat stays fresh from weekend shopping, I'll peel potatoes on Monday night and leave soaking in water (or occasionally even Sunday), and I generally have the veg prepared the night before as well.
Wednesday has to be fast to get DD out to training - so HM pizza (buy bases, add sauce, grated mozzarella and whatever we fancy that night on top) is a favourite. Or gorgonzola pasta as that takes only minutes. Sometimes it's just cheese on crackers and then dinner after training.
Thursday is often freezer night - portions of HM dinners or convenience food.
Friday is usually takeaway or something like an M&S meal.
I am in a slightly bad rut at the moment, but I used to be good about having things ready to cook quickly when I get in. I try and do the prepwork the night before after dinner, so I can just cook quickly when I get in at 6, while trying to supervise homework and getting the day squared away.
Things like chopping chicken and putting it in a freezer bag with marinade (especially for things like chicken tikka masala in chunks, or maybe thighs/drumsticks with oliveoil/lemon/garlic and herbs to roast quickly).
I do medditeranean veggies too - dice up (to equal sized chunks) things like onion, garlic, tomatoes, courgette, peppers and mushrooms (DH and DD not fans of aubergine or I'd have those too) with seasoning, olive oil and balsamic vinegar - overnight if possible - and roast for 20-40 mins depending on size of chunks. Great veg dish as a side, and leftovers freeze well to add to a jar of tomato sauce with pasta, and some meat of some sort (chicken, bacon pieces, prawns, meatballs). I tend to do big batches of it, as the leftovers are so handy - and I tried freezing half a batch before cooking recently and they were just as good cooked from frozen. I'd always have frozen peas for fast veg, and tinned corn as well.
I have a mix of HM dinners from the basic spices and others using good jars/sauces. So I try to do stirfry type meals a lot, but prep the veg the night before and have in airtight tubs. I've learned how to do HM potato wedges rather than using a packet mix or running to takeaway for chips - and we always have oven chips and some fish in batter or similar in the freezer for emergency nights. My storecupboard is well stocked too, so I can make a meal from tins/jars that is still pretty tasty and decent food. I keep things like bacon lardons (I get the Lidl double pack) in the fridge which are long lasting but versatile, and cooked prawns in freezer to throw into a jar of sauce. I always have raw chicken, and I try to have some of that diced before freezing; usually sausages and meatballs, and some fish (salmon darnes or cod fillets) and meat (lamb chop, pork chop, steak) that I can take out the night before. And I usually have some fresh pasta, either tagliatelle or ravioli/tortellini types, in the fridge as well, and always lots of cheese.
I recently had a period where I managed to get a few batches of HM tomato sauce into freezer in 1 meal portions. Very useful. I also have a few portions of 1 cup of fried onion and garlic there at the moment - which is about the same as 1 onion and 1 clove garlic - that being the slow part of starting meals, and the basis of a LOT of ours, it seemed sensible.
Some leftover roast meats are also great from freezer - very thinly sliced beef or pork can go into Chinese sauces with a few fresh veg.