To make this recipe gluten free, replace the all-purpose flour with a certified gluten-free all-purpose flour blend or a gluten-free thickener suitable for sauces. Also verify that the beef broth, chili powder, cumin, pulled pork, sour cream, diced tomatoes with green chiles, and shredded cheeses are certified gluten free, as some packaged products may contain hidden gluten or anti-caking agents. Corn tortillas are often gluten free, but it is still important to confirm the label. If cross-contact is a concern, use clean cookware, utensils, oil, and prep surfaces throughout preparation.