To ensure that this delicious lasagna is gluten-free make sure all the ingredients you use including the lasagna sheets are certified as gluten-free. Choose lasagna sheets made from rice, corn or other grains that are free of gluten. Additionally replace the all-purpose or plain flour, in the Parmesan White Sauce (Béchamel) with a blend of gluten-free flour or a single type of gluten-free flour, like rice flour or a gluten-free all-purpose flour. These simple substitutions will allow you to savor the flavors without worrying about gluten.