This spin on baked ziti captures all the comforting appeal of the classic in a better-for-you way. It's made with whole grain pasta (although regular pasta would be fine, if you prefer it), packed with vegetables - sautéed mushrooms, broccoli, and sun-dried tomatoes -- and made cheesy and creamy with a more healthful than typical balance of part-skim ricotta, mozzarella and Parmesan.