Preheat oven to 350 degrees
Spray 9x13 casserole dish with cooking spray or olive oil - set aside
Cook egg noodles to package directions - drain
In a large bowl, combine cooked noodles, cooked chicken, soup, dip, cheddar cheese & 1 cup of the mozzarella cheese - stir well to combine
Transfer to prepared baking dish
Top with remaining mozzarella cheese & fried onions
Bake 25-30 minutes or until hot & bubbling