Melt margarine in large skillet. Add ground beef. Brown, stirring til crumbly; drain. Stir in garlic, salt, pepper, sugar and tomato sauce. Simmer for 20 minutes.
Fill large pan with water and bring to a boil. Add noodles. Cook, uncovered, til al dente; drain. Rinse with cold water.
Mix the green onions, cream cheese and sour cream in a bowl.
Coat a large baking dish with cooking spray. Layer noodles, sour cream mixture and ground beef mixture in baking dish. Top with Cheddar cheese. Bake at 350 for 30 minutes or til bubbling and heated through.