Had a patty melt on sourdough with caramelized onions and au gratin potatoes at a dive bar called 92nd Street here in Scottsdale after my haircut. (It was right next door)
http://92ndstreetcafe.com/
Really tasty and not greasy like patty melts can sometimes be. They charged me just $8 for an Oban 14 ! It's normally $14-20 everywhere else.