This Homemade Sopes Recipe is naturally gluten-free when made with pure masa harina, water, and salt. To keep the recipe gluten-free, confirm that the masa harina is certified gluten-free and has not been cross-contaminated during processing. Use clean utensils, parchment paper, and cooking surfaces that have not come into contact with wheat or gluten-containing ingredients. Also verify that all toppings, such as beans, meats, sauces, crema, and cheese, are gluten-free before serving.