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.
Mayonnaise on grilled cheese is an abomination.
For the absolute best grilled cheese ever just put sliced cheese between two slices of bread, drop 2 tbsp (28.5g for those of you not using freedom units) of butter in a pan just hot enough to make it sizzle, put your sandwich in the melted butter and flip after 3 minutes.
Edit: got so worked up about the mayo abomination I forgot what I came here to say. My food hack is self rising flour in anything that used the flour, salt, baking powder trio. Easier, quicker, and no chance of messing up the ratio and getting crackers instead of biscuits.
In my opinion, grilled cheeses really need that bit of acidity to be great grilled cheeses.
I tried the mayo grilled cheese once and I agree. Not for me at all! I like to butter the outsides and that’s about it.
Nothing that was already good has ever been improved by mayonnaise. Mayo is a topping people put on mediocre and boring foods to make them edible.