I love using white meat rotisserie chicken in this recipe, but you can use a combination of white and dark meat. You can alternately use cooked boneless, skinless chicken breasts.
Although pre-bagged shredded cheeses from the grocery store are easier, I always suggest grating your cheese straight from the block. Prebagged shredded cheeses contain anti-caking agents which prevent them from melting as well while also causing the texture to be grainy.
Ranch seasoning packets can be found at your local grocery store, or you can opt to make your own homemade ranch seasoning mix in its place.
Do note that the 8 ounces of rotini pasta called for in this recipe is HALF the amount of a standard 16-ounce box. Fusili, ziti, or penne pasta are good substitutes.
Season the white sauce with salt and pepper, to taste. If using a full packet of ranch seasoning mix, as we did, you probably will not need additional salt in the sauce.
Casserole can be prepared a day in advance. Cover with aluminum foil and cook for 45-60 minutes until heated through.
Refrigerate leftovers for up to 3 days or freeze up to three months in an airtight container.