The Cheddar Melt features a grilled beef patty, sauteed onions, teriyaki glaze, and cheese sauce on a rye bun. It's being offered at $3.49 for a limited time only and appears to be tied-in with the Green Bay Packers and the start of the NFL football season.
According to the Green Bay Press Gazette, the burger was first introduced in the late '80s and stuck around into the '90s but was then discontinued. It did however make a brief reappearance about 10 years ago.