Preheat oven to 350°. Cook noodles according to package directions., Meanwhile, in a large skillet, cook beef over medium heat until no longer pink; crumble meat; drain. Add the tomato sauce, onion, sugar and seasonings. Bring to a boil. Reduce heat; cover and simmer for 10 minutes. In a small bowl, combine the cream cheese, sour cream and milk., Place half of the noodles in a greased 13x9-in. baking dish; top with 3 cups meat mixture. Layer with cream cheese mixture, spinach, and remaining meat mixture and noodles. Sprinkle with cheeses (dish will be full)., Bake, uncovered, until bubbly, 40-45 minutes. Let stand for 10 minutes before serving. If desired, top with minced fresh parsley.