Along with the standard quarter-pound of flame-grilled beef, iceberg lettuce, and mayo (they've taken out the ketchup) on a toasted sesame seed bun, they've added thick-cut, hardwood-smoked bacon, Swiss cheese, and sauteed mushrooms.
You can expect to find it around the $5 mark at participating Burger King restaurants.
Nutritional Info - Burger King Mushroom & Swiss Bacon Whopper (329g)
Calories - 760 (from Fat - 440)
Fat - 49g (Saturated Fat - 16g)
Sodium - 1430mg
Carbs - 48g (Sugar - 10g)
Protein - 31g