Jack in the Box adds Portobello Mushroom Buttery Jack
By Lauren Seegers • July 24, 2015
Jack in the Box has launched the new Portobello Mushroom Buttery Jack. This burger is the newest craveable offering from the popular Buttery Jack line and features flavorful Portobello mushrooms, creamy peppercorn mayo, grilled onions, Swiss cheese, and melted garlic herb butter atop a quarter pound signature beef patty, served on Jack’s gourmet signature bun.