- Preheat oven to 350F. Prepare a 9x13-inch baking dish by spraying with non-stick cooking spray; set aside. 
- In a large bowl, combine the cooked pasta, chicken, 1 cup of the cheese, cream of chicken soup, sour cream, salsa, and taco seasoning.  
-  Pour the mixture into the prepared baking dish. Sprinkle the remaining cheese over top of the spaghetti mixture. 
- Cover with foil and bake at 350F for 25-30 minutes, until the cheese is melted. 
- Cool slightly before serving.