I was at Panera today and was told the Mushroom & Portabello sandwich cannot be made without the cheese, as they are wrapped pre-made and then just heated up.
Nevertheless, there are several great options at Panera. They have the Mediterranian Veggie Sandwich, which can be made without the feta. They also have at least 4 vegetarian soups, two of which are also vegan. Today, for example, they had Vegetarian Vegetable, Veggie Black Bean, and Veg Carrot Soup on the menu. So, for a tasty meal, you can get half of a Mediterranian Veggie sandwich and one of their veg soup options.
slops, gloops, and gruels.