Great sandwich. Turned this into a grilled ham and cheese sandwich. I made the sandwich with ham and cheese on the inside, spread the mayonnaise on the outsides of the bread slices, and grilled it. Restaurants do make grilled sandwiches with mayonnaise instead of butter, as the other reviewer said. Served it with potato chips and sweet pickles.
AAAhhhh!!! This a great grilled cheese most people don't relise this is exactly how restaurants make there's too. You won't even know its not butter! Yummmy