To make these Blueberry Drop Scones gluten free, replace the all-purpose flour with a high-quality 1:1 gluten-free baking flour blend that contains xanthan gum. Use the same measurement as the original flour amount.
Also confirm that the baking powder, sugars, vanilla extract, and any optional coarse sugar are labeled gluten free. Gluten-free dough can be more delicate, so mix gently and avoid overworking it. If the dough feels too soft, chill it for 10 to 15 minutes before dividing and baking.