(should be cut to about the same size):
In a large saucepan, sauté onions and garlic until onions are soft. Then add crushed tomatoes and all other ingredients. Cook on medium heat for about 5 to 10 minutes.Set aside.
Lightly grease bottom of casserole dish and add enough tomato mixture to cover bottom. Layer vegetables alternating them, until bottom is covered. Spread a layer of sauce over vegetables and repeating process until no vegetables are left. To avoid browning too quickly, loosely cover with parchment paper.
Preheat oven to 350 degrees. Bake vegetables for about 1 hour or until tender and serve.
(Option: Remove parchment paper, garnish with shredded parmesan cheese and brown for 5 minutes.)