Preheat your oven to 375°F (190°C).
Wash and peel (if necessary) the vegetables. Cut them into evenly-sized chunks. Combine zucchini, eggplant, potatoes, and bell peppers in a large mixing bowl.
In a separate bowl, mix together chopped tomatoes, sliced onion, minced garlic, olive oil, dried oregano, dried thyme, salt, and pepper. Toss the vegetable mixture with this sauce until well coated.
In a baking dish, arrange the coated vegetables evenly.
Pour the tomato sauce and water over the vegetables. Ensure the sauce is evenly distributed.
Cover the baking dish with aluminum foil and bake in the preheated oven for about 45 minutes or until the vegetables are tender. You can uncover for the last 15 minutes to allow the top to brown slightly.
If desired, garnish with fresh parsley before serving. Remove from the oven and let it cool for a few minutes. Serve the Traditional Briam Dish as a delicious and hearty main course.