To make this Chicken Pad Thai gluten free, first confirm that your fish sauce, sweet chili sauce, and any packaged ingredients are certified gluten free, since some brands may contain gluten or be processed in shared facilities. Rice noodles are naturally gluten free, but it is still wise to check the package label to be safe. If peanut oil is unavailable, use another gluten-free neutral oil such as avocado oil or vegetable oil. For anyone with celiac disease or severe gluten sensitivity, use clean pans, utensils, colanders, cutting boards, and serving dishes to avoid cross-contact from wheat-based noodles or sauces used in the same kitchen.