They hammer the meat flat, bread it, fry it, and somehow that's been enough for about three centuries.
Fun fact: In Austria, only veal can legally be labeled "Wiener Schnitzel" — pork must be listed differently.
Someone looked at a perfectly good burger and thought yeah but what if we melted cheese on it.
Fun fact: The U.S. trademark for the word "cheeseburger" was granted to a Denver restaurant in 1935.