This Traditional Greek Moussaka can be made gluten-free by replacing the flour in the béchamel sauce with a certified gluten-free all-purpose flour or cornstarch (adjusting quantity as needed to achieve proper thickness). Ensure all seasonings, spices, and cheese varieties are certified gluten-free and that no additives containing gluten are present. All other components of the recipe—the vegetables, minced meat, tomatoes, and spices—are naturally gluten-free.