To make this recipe gluten free, replace the refrigerated pie crusts with certified gluten-free pie crusts and use a gluten-free canned apple pie filling or a verified gluten-free homemade filling. Also confirm that the brown sugar, butter, and cinnamon sugar are labeled gluten free or free from cross-contact concerns, since packaged products can vary by brand. Because gluten-free crusts can be more delicate, handle them gently when placing them in the skillet and monitor the baking time closely so the crust browns evenly without becoming too fragile.