And how might you get all of your protein needs? Assuming you want to build or at minimum maintain.
OMAD would be tough unless you've gone low carb or keto.
But if you are; protein is not an issue doing - at all.
Go to town on chicken, fish, all kinds of pork and beef.
Get your fiber from cruciferrous veggies (broccoli, cauliflower, sperry etc)