For an even richer flavor, use homemade chicken broth. If you don't have Herbes de Provence, a mix of dried thyme, rosemary, and savory works well as a substitute. To make this soup even heartier, add cooked egg noodles or rice during the last 5 minutes of simmering. For a vegetarian option, substitute vegetable broth for the chicken broth and omit the chicken. Consider adding white beans or lentils for protein.