To make this Creamy Ham au Gratin Potatoes recipe gluten-free. Simply swap out the all-purpose flour. For a gluten-free alternative. Many gluten-free flours. Such as rice flour. Or a gluten-free all-purpose blend. Work wonderfully. For thickening sauces. Just like traditional flour. This easy substitution. Ensures that everyone can enjoy. This comforting dish. Without worrying. About gluten sensitivities. Enjoy the same delicious, creamy texture. Now accessible to all!