To make this Oven Roasted Sausage and Potatoes recipe gluten-free, confirm that the smoked turkey sausage and Cajun spice are certified gluten-free or labeled free from gluten-containing additives. Some smoked sausages and spice blends may contain wheat-based fillers, flavorings, or anti-caking agents, so check labels carefully. The potatoes, onion, olive oil, sea salt, black pepper, and smoked paprika are naturally gluten-free, but they should still be checked for cross-contact when necessary. Use clean bowls, utensils, cutting boards, baking sheets, and foil to prevent cross-contamination.