As, http://www.cheese-burger.net explains, there are a handful of theories connected to who, when and where the cheeseburger was first created. We're going to go with one… since we're from Los Angeles!
Anywhere between 1924 and 1926, a chef named Lionel Sternberger created the first cheeseBURGER (how appropriate?!) in Pasadena, California. Food legend has it that a homeless man ordered a burger from Sternberger. He then suggested that the chef add a slice of cheese!
Tada! Happy #NationalCheesburgerDay on September 18th!