This creamy chicken and mushroom soup is full of flavor with diced chicken breasts, carrots, celery, and fresh sliced mushrooms. The heavy cream is added near the end of the cooking time. Serve the soup as a first course or serve it as a lunch or supper soup with a sandwich or salad. If you are using pre-cooked chicken, add it to the soup about 10 minutes before it's done. Feel free to make changes in this tasty soup. Use cooked turkey or chicken, but add it near the end of the cooking time. Or add some potatoes or rutabaga to the soup. Steamed peas may be added just along with the cream just before the soup is done.