1. Preheat oven to 450°. Spray an 8-inch square baking dish with cooking spray.
2. In food processor, blend crushed tomatoes and juice, chicken broth, and garlic. Pour into a medium saucepan and bring to a boil. Stir in uncooked pasta, 3 tablespoons olive oil, oregano, salt, and pepper.
3. Line bottom and sides of the baking dish with one-half to two-thirds of the tomato slices; pour in pasta mixture. Arrange remaining tomatoes on top. Drizzle with remaining olive oil.
4. Put dish on a rimmed baking sheet; bake 30 minutes, or until tomatoes are slightly crispy and pasta is cooked. Cool 5 minutes.