Jack in the Box Adds Portobello Mushroom Buttery Jack

July 24, 2015

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Portobello Burger is the latest in the popular Buttery Jack line
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Jack in the Box announced today the launch of 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.