Freeze leftovers in individual portions so each serving can be quickly reheated in the microwave. Microwave frozen manicotti, uncovered, at HIGH 4 to 5 minutes or until hot, rotating every minute.
1. Preheat over to 350°.
2. Cook pasta according to package directions, omitting salt and fat.
3. While pasta cooks, combine 1/2 cup mozzarella, 1/4 cup Parmesan, spinach, and next 7 ingredients in a large bowl; stir well. Drain pasta, and rinse with cold water to prevent sticking; drain. Spoon spinach mixture evenly into pasta shells (about 1/3 cup filling in each).
4. Spoon 1/2 cup pasta sauce in bottom of a 13 x 9-inch baking dish coated with cooking spray. Arrange stuffed pasta shells over sauce in dish; top with remaining sauce. Sprinkle evenly with remaining 1/2 cup mozzarella, remaining 1/4 cup Parmesan, and parsley. Cover and bake at 350° for 45 minutes or until thoroughly heated. Uncover and bake an additional 5 minutes.