I’d love it if I only needed to eat once a day and could focus on having that one meal be really good.

OMAD (one meal a day) or intermittent fasting might be worth trying. There was a good while where I was restricting calories and only eating in the evenings, with a pretty decent morning gym session (60 min weight lifting + 30 min running), and it seemed to work well until COVID lockdowns messed up my routines. I was never hungry during the day unless I ate whatever random junk someone brought to the office.