To make this Easy Chicken Hashbrown Casserole gluten-free. You'll need to make a few substitutions. First, use a gluten-free cream of chicken soup. You can find this in most grocery stores. Or make your own at home. Using gluten-free flour. As a thickener. Ensure your cornflakes are certified gluten-free. As some brands may contain traces of gluten. These simple swaps. Will allow you to enjoy. This delicious, comforting casserole. Without worrying about gluten. Always double-check ingredient labels. To ensure they're gluten-free.