Now through May 13th, Whataburger Rewards members can enjoy a FREE Mushroom Swiss Burger with the purchase of a medium fries and medium drink! Just open the Whataburger app and check the Rewards section to redeem this tasty limited-time offer.

Not a Rewards member yet? You're in luck! New members can score a completely FREE Whataburger (no purchase required) and earn 500 bonus points after placing their first online order of $10 or more through the Whataburger app.

To get started, download the Whataburger app, create your account, and during sign-up, enter the promo code: NVKHB8RN83FJ when prompted. It's a delicious way to start earning rewards—and grab a free burger or two along the way!

This burger features two grilled all-beef patties topped with melted Swiss cheese, savory grilled mushrooms, and a creamy au jus sauce, all nestled within a toasted bun. The combination of flavors offers a rich and satisfying experience, making it a sought-after choice among customers.