I always try to make any prepping or cooking, unless very quick & simple, do a couple of meals. If I took your meal for example, the chicken will definitely also do a salad or sandwich, a curry or risotto, and a soup.
If I make, say mashed swede, braised red cabbage, I make several portions and freeze, so I'm only cooking say, one of them, from scratch.
I prep and parboil parsnips and put in the freezer, so they are ready to roast alongside potatoes.
Roast potatoes are usually just done once, but I might boil up extra if I'm going to use them over the next few days.
I might do extra carrots or leeks, with a view to using them for soup. I might think that I would cook extra leeks and boil extra potatoes and make leek and potato soup the next day for instance.
For pudding I might make a cake that will be eaten during the week. I also always have a bag of crumble mix in the freezer, and some ice cream.
I run a sink full of hot, soapy water and dump everything in as I go, guests / any family around can help with any prep they like, or tackle the sink!
Having said that, I do enjoy cooking, and planning like this is not usually a chore for me. I think you should do what suits you - some days cooking a huge meal can feel just the right thing to do, other times, a chore - so do something simpler.