In a Dutch oven bring water and chicken broth to boiling. Meanwhile, halve summer squash lengthwise and cut into 1/2-inch slices. Add squash, greens, sweet pepper, pasta, onion, carrot, rosemary, seasoning blend, and pepper to Dutch oven.
Return to boiling; reduce heat. Simmer, covered, about 15 minutes or until pasta and vegetables are nearly tender.
Stir in chicken. Cook, covered, about 5 minutes more or until pasta and vegetables are tender. Stir fresh basil into soup. Makes 6 servings (7-1/2 cups).