Want to make this casserole gluten-free? It’s easier than you’d think! Swap the all-purpose flour for a gluten-free flour blend—make sure it’s one meant for thickening, so you get that nice, creamy sauce. Check your corn tortillas too; most are naturally gluten-free, but double-check the packaging just to be sure. Everything else in this recipe should be safe, but always be careful with your canned goods (like the diced tomatoes with green chiles) and spices to make sure there are no sneaky gluten additives. With these simple swaps, you can enjoy all the bold, cheesy, comforting goodness without any worry.