friend asked me and I have no idea how Costco does theirs, have only had their chicken twice. It's tasty stuff indeed. My friend has a Showtime Rotisserie and has tried a variety of things like seasoning both the inside of the cavity and the skin, experimenting with lemon pepper, chili powder, garlic salt, and even an onion inside but nothing is coming close. Anyone know how the Costco roast chicken is made?