To make this Turkey Noodle Soup gluten free, replace the egg noodles with certified gluten-free noodles or gluten-free pasta. Verify that the cooked turkey, turkey stock ingredients, dried herbs, peppercorns, and any packaged broth or pasta are labeled gluten free. If using store-bought broth to supplement the stock, choose a certified gluten-free option. Use clean cookware, utensils, strainers, and serving bowls to prevent cross-contact with gluten-containing foods.