Boil your pasta till it is cooked, drain and return to pot over low heat.
Preheat oven to 350F, spray a 9x13 dish with some non stick spray
Add your chicken, cream cheese, milk, sour cream, ranch mix and 2 oz of your mozzarella (leave the other 3 oz for topping) to your cooked pasta, stir well till everything is mixed together and cheese is melted.
Add pasta mixture to your casserole dish.
Top with remaining cheese, bacon bits and green onion.
Cover with foil and bake in oven for 25 minutes.
Cut into 6 equal servings , each serving is approx 7.5 oz.. Recipe is okay to freeze.