Cook noodles according to package directions. Meanwhile, in a large nonstick skillet over medium heat, cook beef until no longer pink. Add garlic; cook 1 minute longer. Drain. Stir in the tomato sauce, sugar, salt and pepper; heat through. Drain noodles; stir into beef mixture., In a small bowl, beat the cream cheese, ricotta cheese and sour cream until blended. Stir in half of the onions., Spoon half of the noodle mixture into a 13-in. x 9-in. baking dish coated with cooking spray. Top with cheese mixture and remaining noodle mixture., Cover and bake at 350° for 30 minutes. Uncover; sprinkle with cheddar cheese. Bake 5-10 minutes longer or until heated through and cheese is melted. Sprinkle with remaining onions.