This slow-cooked soup turns classic ratatouille vegetables into a comforting, hands-off meal. It combines fresh tomatoes, bell peppers, and squash in a savory chicken broth, letting the flavors develop slowly over several hours. Zucchini and eggplant are added near the end of cooking to maintain their tender texture. It is a perfect choice for a late summer dinner when garden produce is abundant. Finish each bowl with fresh basil and a sprinkle of Parmesan cheese for a salty kick.