To make these Sweet Potato Biscuits 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 the baking powder, cinnamon, sugars, butter, and any packaged ingredients are labeled gluten free, since brands and manufacturing practices can vary. Because gluten-free biscuit dough can be slightly more delicate, handle it gently and add the milk gradually so the dough does not become too wet. Chilling the shaped biscuits briefly before baking can also help them hold their shape better. For anyone with celiac disease or severe gluten sensitivity, use clean bowls, cutters, parchment, baking sheets, and utensils to avoid cross-contact.