Cook manicotti shells according to directions. In bowl, combine spinach, cheeses, sour cream, egg, parsley and garlic. With an ice tea spoon, fill each shell with mixture. Pour half the sauce in a shallow glass (2-3 quarter) baking dish. Arrange shells in a single layer. Pour remaining sauce over shells, sprinkle with Parmesan cheese. Microwave covered with wax paper 10-12 minutes or until hot in the center. Rotate the dish twice.