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.



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.