To prepare this dish gluten-free, substitute the all-purpose flour with a 1:1 gluten-free flour blend or use cornstarch (use 1½ tablespoons and mix with a small amount of broth before adding). Replace the egg noodles with gluten-free pasta or mashed potatoes, and ensure the soy sauce is certified gluten-free (such as tamari). Always double-check ingredient labels for hidden gluten sources.