Brown beef and garlic in skillet. Add next 4 ingredients and simmer uncovered 20 minutes. Cook spaghetti according to package. Combine cream cheese, sour cream & green onions. In greased 13x9 casserole dish, layer: spaghetti, cream cheese mixture, meat sauce & top with grated cheese. Bake uncovered @ 350 until hot and bubbly (approx 30 min).