In a medium skillet over medium heat, combine beef, onion and garlic and sauté, breaking up meat with a spoon, until meat is browned and vegetables are tender, 6 to 7 minutes. Add a little oil if needed. Stir in tomato sauce and simmer several minutes. Pour over the noodles and top with cheese; do not mix. Bake, covered, until bubbly, about 35 minutes.