To make this recipe gluten-free, substitute the all-purpose flour with a gluten-free flour blend suitable for roux-based sauces. Ensure the Dijon mustard and all dairy products used are labeled gluten-free. For the breading, replace kettle-cooked potato chips with certified gluten-free chips or crushed gluten-free crackers. Use gluten-free pasta such as brown rice or corn-based elbow macaroni. Always double-check all ingredient labels to ensure no hidden gluten-containing additives are present.