Sprinkle bottom of a lightly greased 11- x 7-inch baking dish evenly with garlic. Layer with tomatoes and next 5 ingredients, sprinkling with 1/8 teaspoon each of salt and pepper between layers. Drizzle with 2 tablespoons oil.
Bake at 350° for 45 minutes. Combine cornbread, next 3 ingredients, and remaining 1 tablespoon olive oil. Sprinkle over vegetable mixture; bake 10 more minutes or until top is golden. Let stand 10 minutes before serving.