To make this recipe gluten-free, use certified gluten-free nacho-style chips instead of regular Doritos.
Verify that the taco seasoning is gluten-free, as some packets may contain wheat-based fillers or anti-caking agents.
Use a gluten-free condensed cheddar cheese soup, or substitute with a homemade gluten-free cheese sauce.
Check that the Rotel tomatoes, sour cream, milk, and shredded cheddar cheese are labeled gluten-free.
Prepare the casserole with clean utensils, cookware, and surfaces to prevent cross-contamination.