After a three-year hiatus and overwhelming fan demand, including a petition with more than 7,200 signatures, the beloved Whataburger Mushroom Swiss Burger is finally making ... creamy au jus sauce, ...

au jus sauce and “a generous layer” of grilled mushrooms, all served on a toasted bun, a product description says. Whataburger’s Mushroom Swiss Burger is back on menus from April 1 through ...