To make this Mexican mac and cheese gluten-free, substitute the elbow macaroni with a certified gluten-free pasta of your choice. Replace the all-purpose flour in the cheese sauce with a gluten-free flour blend that includes a thickener such as xanthan gum or use cornstarch (1 tablespoon in place of 2 tablespoons flour) to create a roux. Ensure all additional ingredients, especially chorizo and shredded cheese, are labeled gluten-free, as some may contain additives or be processed in facilities with gluten.