How often do you cook? Have the same few things in rotation? Cook for anyone else too? Prep multiple days at a time or cook every day? I personally work a weird schedule so I prep food 5 days at a time. Also only eat one big meal a day. That could be anything in my dozenish meals rotation. I prep for my girlfriend too but shes simple. For her I cut up some vegetables (bell peppers, cauliflower, celery and carrots usually) then cook up a couple pounds of seasoned meat (chicken breast or 90/10 ground beef). What about you?
Much more time efficient to cook 12 portions of something at once than cook something individually 12 times.
If you have a big enough freezer you still get lots of verity of meals. (And can still cook stuff ad-hoc)
I can cook a decent meal in half an hour, often less. That’s time efficient enough.