Make it vegetarian, or make it vegan! Or garnish with creme fraiche if it’s in your liking. This low-calorie Cream of Mushroom Soup with Green Onions is quick to make. Each serving is only 60 calories. The dark brown caps of cremini mushrooms add a delightful earthiness to the pureed soup. The concoction is frothy like a steamy cappuccino, especially if you use…