This recipe is naturally gluten-free when all packaged ingredients are verified gluten-free.
Confirm that the cream cheese, mayonnaise, cheddar cheese, garlic powder, sea salt, and black pepper are labeled gluten-free.
Use plain cooked chicken without marinades, breading, or seasoning blends that may contain gluten.
If using rotisserie chicken, check the label for gluten-containing seasonings or additives.
Prepare the casserole with clean utensils, bowls, pans, and baking dishes to prevent cross-contamination.