To make this recipe gluten free, replace the all-purpose flour with a high-quality 1:1 gluten-free baking flour blend that contains xanthan gum, or add xanthan gum if your chosen blend does not include it. In addition, confirm that the apple pie filling, vanilla extract, cinnamon, and any other packaged ingredients are certified gluten free, as some brands may contain additives or be subject to cross-contact. Because gluten-free dough can be more delicate, it may help to chill the dough slightly before rolling and to roll it between sheets of parchment paper for easier handling.