It simply can't be done on demand. I have first hand experience: I work with a chef who spends a day to create a week's worth of meals for me but smaller chunks are not feasible as you need to prep, cook etc and it takes hours -- even if some of the work can be done in parallel while one dish is cooking the other can be prepared etc but still you just can't have a meal ready in 45 minutes after you click order. Quite a few meals actually need to be started the previous day so the dish or parts of it can marinade / simmer / slow cook / set / etc overnight. (I think you meant private chef -- those are employed by the super rich, a personal chef works for multiple clients.)

Also anyone like him will strive to have his schedule full for a few weeks ahead.

So no, this is not Uberable. But, if you are in Vancouver and want good food, drop me an email I will connect you with Michael :)

Like https://sfbay.craigslist.org/search/bbb?query=personal+chef ?

I don’t know how that would work in Uber-like environment. The chef in question simply might not have the ingredients on hand (especially expensive ones, like truffles or caviar), whatever my heart desires might require significant prep lead time (roasted suckling pig) or not very suitable for delivery (seafood towers, tartars, sorbets).