Brown ground beef, then add garlic, salt and spaghetti sauce. Simmer for 30 minutes.
While that simmers, mix together cream cheese, sour cream and onions.
In a greased 9X13 inch pan, layer 1/3 sauce, 1/2 noodles, 1/2 cream cheese mixture, 1/2 mozzarella cheese.
Cover with 1/3 more sauce, remaining noodles, cream cheese, mozzarella cheese and sauce.
Bake at 350 degrees uncovered for 30 minutes.
Remove from oven, cover and let sit for 10 minutes before serving.