Preheat oven to 375 degrees F.
Heat oil in a large skillet. Add the onion and cook for 3-5 minutes, until translucent. Add the garlic and cook for a further 2-3 minutes.
Add the tomatoes, oregano and thyme. Lower the heat and cook for 10-15 minutes, until thickened.
Add the sea salt, black pepper and basil. Remove from heat and ladle into a round baking dish.
Arrange the vegetable slices on top in any pattern you wish. Sprinkle with herbs, salt and pepper.
Cover with foil and bake for 50-60 minutes, until the vegetables are tender. Let cool a bit and serve