I’ve never seen anyone else do this either irl or in a video but I’m sure lots of people do it. When I make a grilled cheese I mayo both slices then put both slices in the pan at the same time rather than stacked in sandwich form so it takes half the time to cook and I don’t need to flip it.
I like to make Velveeta mac and cheese with added quesadilla mix shredded cheese and some cayenne pepper. Makes it thick and with a little kick. Sometimes I’ll put it in a small dish and bake it until the top is brown too.