Okay. A friend tells me my method sounds crazy and as though I'm being held hostage by Sue Perkins but it works for me so I'll share it with you.
I have a few meals that share ingredients. For about an hour on a weekend when I know I'm not going to want to cook during the week I will go crazy and speedcook them. I worry little about mess or how many dishes or pans will be left behind in my frantic hour. I just cook as though someone were yelling "AN HOUR LEFT, BAKERS" in my ear.
A standard week will be two pasta dishes (say mac and cheese and bacon, and mozzerella and ham), a hash, and an enormous pan of mashed potato. So the potatoes will be chopped and go on to boil. The potatoes or sweet potatoes for the hash will go onto boil. An entire bag of pasta will go on to boil. An entire large pack of bacon will be fried, then sat on kitchen roll to soak up the fat. The same pan will then be used to fry onions. Small children will be recruited to chop mozzarella, tear up ham and tear up bacon. The sweet potatoes will be thrown into the frying pan with the onions, and then half the bacon. It gets put into a glass tupperware dish and set to cool (DISH 1)
A basic cheese sauce will be made up (butter and flour, then milk, then grated cheese), and then half the pasta will be added, and the remaining bacon. It gets poured into a casserole dish and left to cool (DISH 2)
With my other hand I'm stirring a tomato sauce made of tinned tomatoes and whatever veg and herbs came to hand. The remaining pasta is added and then the mozzarella and ham, with a little left to sprinkle on top. That's poured into another casserole dish (DISH 3)
All that is left is to mash the enormous bag of potatoes with butter and milk. It's usually about three family sized portions when mashed. That's set into yet another glass tupperware dish to cool, because I know if I have potatoes it's only a ten minute job during the week to fry up some meat of some variety (cheap steak, sausages, pork chops) and add some veg (DISHES 4-6)
Everything gets lidded and cling filmed and put in the fridge. Pans get very gradually loaded in the dishwasher over two days. I come home, I grab one of the ready prepared meals and shove in the oven. It is probably the most manic way of cooking ever, and I won't claim that the dishes are the healthiest (though you could probably do similar with healthier options) - but it is healthier than a takeaway, and cheaper, and it works, and it keeps us fed on weeks where I am losing my mind.