This recipe can be naturally gluten free, but it is important to check the seasoning blend carefully. Some seasoned salt mixtures may contain additives or anti-caking agents that include gluten or are processed in facilities with gluten. Choose a certified gluten-free seasoning blend if needed. Also make sure the aluminum foil, utensils, tray, and toaster oven surfaces are clean and free from cross-contact if you are preparing this for someone with celiac disease or a strong gluten intolerance.