To make these Apple Cider Doughnuts gluten free, replace the all-purpose flour with a reliable 1:1 gluten-free baking flour blend that includes xanthan gum or a similar binder. Also confirm that your baking powder, baking soda, confectioners’ sugar, and apple cider are labeled gluten free, as brands may vary. Because gluten-free dough can be softer and more delicate, chilling the dough thoroughly is especially important before cutting and frying. If needed, use a little extra gluten-free flour on the work surface to help with handling. For anyone with celiac disease or severe gluten sensitivity, use clean bowls, cutters, parchment, oil, pans, and serving tools to avoid cross-contact.