Along with the quarter pound signature beef patty with melted garlic herb butter common throughout the line, the Portobello Mushroom Buttery Jack also includes Portobello mushrooms, Swiss cheese, peppercorn mayo, grilled onions, and the chain's signature bun.
The new burger joins the Classic Buttery Jack and Bacon & Swiss Butter Jack on the menu.
It's available for a limited time at participating Jack in the Box restaurants through mid-September. Prices may vary but you can expect it to cost around $5.
Nutritional Info - Jack in the Box Portobello Mushroom Buttery Jack (275g)
Calories - 807 (Calories from Fat - 462)
Fat - 51g (Saturated Fat - 23g)
Sodium - 1081mg
Carbs - 51g (Sugar - 12g)
Protein - 38g