Lemony Roasted Chicken Soup with Rosemary Croutons

Name: Lemony Roasted Chicken Soup with Rosemary Croutons
Ingredients: Roasted Chicken Soup; 2 large bone-in skin-on chicken breasts; 4 carrots; 4 ribs celery; 1 medium yellow onion; 2 lemons; 6 cups low salt chicken broth; 1 cup cooked barley, brown rice or farro (I actually used a combo of the three); 1 pinch crushed red pepper; olive oil; salt and pepper; Toasted Rosemary Croutons; 1 tablespoon finely minced fresh rosemary; zest of one lemon; 2 tablespoons shredded parmesan; 2 tablespoons olive oil; 8 slices baguette or French bread