If your DP is fussy just leave him to sort himself out or alternate cooking days and shop for meals cooked by both of you.
With the chicken, that will do a roast, so you need potatoes and veg, gravy and stuffing and there should be leftovers (don't start people) so you need something to make those into. This could be curry, pasta bake, fajitas, or have the meat with rice, chilli sauce and coleslaw ala Nando’s.
What do you plan to do with the mince? Chilli? Need rice, maybe tortillas, salsa, sour cream. Get some cheese, tomato sauce jar and wraps too and you could make enchiladas with the leftovers.
Or you could make bolognese sauce and have some with spaghetti and then make lasagne with the rest, need flour and Milk to make a sauce and cheese on top. Maybe salad to go With.
Maybe some potatoes and you can have a baked potato, with salad, cheese, chilli if there's some left.
Make chips and have egg and chips. Always get eggs and you can have omelettes, eggs on toast, egg salads, all sorts.
Sausage, bacon and beans for a cooked breakfast?
If any of these ideas appeal, write the ingredients on your list and away you go.
Maybe to start, if planning for a week is too daunting, try doing 2 or 3 days to start, unless the supermarket is miles away and you can't go there too often.