I’ve used peanut oil, coconut oil, vegetable oil, and grapeseed oil all with fine results. Peanut oil is what CFA uses, but don’t use that if anyone has a peanut allergy.
Also, if you’d prefer to bake: substitute bread crumbs (Panko if you got em) for the flour and coat as directed. Bake at 375 degrees F for 10-15 minutes until cooked through.
Find it online: https://hilahcooking.com/chick-fil-a-copycat/