To prepare this dish gluten-free, substitute the regular chicken gravy mix with a certified gluten-free gravy mix, and ensure the cream of chicken soup is labeled gluten-free as well. Many conventional cream soups contain wheat-based thickeners, so double-check labels or opt for a homemade gluten-free version if necessary. All other ingredients, including the spices and vegetables, are typically gluten-free, but it is advisable to confirm package labels when in doubt.