To make this Big Mac Tater Tot Casserole gluten-free. Ensure that all your ingredients are certified gluten-free. Check the labels on your Thousand Island dressing, mayonnaise, and other seasonings. You can substitute the tater tots. With a gluten-free version. Available at most grocery stores. For an extra touch. Try using gluten-free breadcrumbs. Mixed with a bit of melted butter to sprinkle over the top. For added crunch. This way, you can enjoy the same delicious flavors. Without the gluten.