To make Nutella Scones gluten free, replace the unbleached all-purpose flour with a high-quality 1:1 gluten-free baking flour blend that contains xanthan gum or another binder. Confirm that the cocoa powder, baking powder, Nutella, toasted hazelnuts, and all packaged ingredients are certified gluten free or processed without gluten cross-contamination. Gluten-free scone dough may be more delicate, so handle it gently and avoid overmixing.