Both retired, we have a 'cook up day' every few weeks. Combined effort, DH acting as assistant. Casseroles,curries ,pies etc.using recipes for 8.Portions for 1 or2 packed up and in freezer, labelled. Make list.
Sounds a lot of work but it pays off, less cooking and effort.
We have a fishmonger who comes from Grimsby about ever 3 months so buy from him and stock freezer.
When it comes to deciding what to eat, look at list.