I don't think it would work. I've never tried it, BUT, the high fat content of the butter/cream is what keeps the sauce from breaking as long as the heat is not too high.
I like olive oil as well, but do not think it would work or be a particularly good flavor profile for this application.
I have added some cheddar, gouda, and other types of cheese in small amounts to this type of mac & cheese...but even doing that if not watched very carefully will break the sauce.
But then, I consider butter one of the four major food groups...so what do I know...LOL?
The weekly thread may be early or late this week :>)
I just got my power back on last night but I FRIED my dsl modem and my personal computer with the generator (you don’t want that RECIPE - lol)
I’m on my work laptop now and need to limit my postings.
FYI - McDonalds has great WIFI - and I think it’s in all locations - even gets out to the parking lots :>)