First introduced in 2004, the Breakfast Burger consists of bacon, egg, hash browns, a charbroiled beef patty, American cheese, and ketchup on a toasted sesame seed bun. It was previously only available during breakfast hours.
The Breakfast Burger costs $4.39 with a single patty, $5.69 for a double patty, and $5.69 for a 1/3-lb. Black Angus patty (may vary). It's also available with fries and a drink starting at $6.79.
To promote the change in availability, Carl's Jr. has a buy one, get one free coupon for the Breakfast Burger up on their website (good through early March).
Photo via Carl's Jr.