Sonic gives the traditional American cheeseburger a total makeover with the nationwide launch of new Signature Slingers on Monday, March 5, 2018.

Signature Slingers feature a patty made with a blend of 100 percent pure beef along with 25 to 30 percent ground mushrooms and seasonings. The end result is a juicy burger patty that boasts fewer calories and less fat than the brand’s traditional cheeseburgers.

Starting on Monday, March 5, Sonic fans can enjoy the following two varieties of Signature Slingers:

The Classic Sonic Signature Slinger features the new mushroom-blended patty topped with lettuce and tomato, diced onions, crinkle-cut dill pickles, mayo and melted American cheese on a brioche bun.

The Bacon Melt Sonic Signature Slinger consists of a blended burger patty, crispy bacon, melted cheese and mayo on a bakery-quality brioche bun.

Starting at $1.99, Signature Slingers can be found at Sonic locations nationwide from March 5 through April 22, 2018.

I originally reported on “Signature Slingers” last June when Sonic was gearing up to test the new cheeseburgers in select US markets.

If you take a look at Sonic’s online burger menu you can’t help but notice the silhouettes of two new “Top Secret” burgers coming to the chain on March 5. Well, the secret’s out.

Image – Sonic