1. Preheat oven to 375°.
2. Arrange eggplant and zucchini in a single layer on a baking sheet coated with cooking spray. Lightly coat vegetables with cooking spray. Bake at 375° for 15 minutes. Arrange half of eggplant in a single layer in an 11 x 7-inch glass or ceramic baking dish coated with cooking spray. Top with half of zucchini and half of tomato. Drizzle 2 1/4 teaspoons oil evenly over vegetables. Sprinkle vegetables evenly with 1/8 teaspoon salt and 1/8 teaspoon black pepper.
3. Place bread in a food processor; process until coarse crumbs measure 2 cups. Add cheese and next 4 ingredients (through garlic) to processor; process until combined. Sprinkle 1 1/2 cups breadcrumb mixture evenly over tomato. Repeat layers with remaining eggplant, zucchini, tomatoes, oil, salt, pepper, and breadcrumb mixture. Pour broth over top. Bake at 375° for 1 hour or until vegetables are tender and topping is browned.