This recipe is naturally gluten-free when prepared with certified gluten-free corn tortillas. Ensure that the vegetable stock, tomato paste, and all canned ingredients (particularly beans and corn) are verified gluten-free, as some commercial varieties may include additives or flavorings containing gluten. Avoid flour tortillas, as they contain wheat. All optional garnishes listed are naturally gluten-free when using authentic cheese and dairy products without starch additives.