Inspired by the classic French dish, this ratatouille casserole is a colorful and flavorful way to enjoy a variety of vegetables. Made with eggplant, zucchini, bell peppers, tomatoes, and onions, this casserole is a medley of flavors and textures. The vegetables are thinly sliced and layered in a baking dish, then topped with a tomato-based sauce and a sprinkle of herbs. Baked until tender and fragrant, this casserole is a healthy and delicious option for a vegetarian meal.