01 - Preheat oven to 400°F. Line baking sheet with parchment paper.
02 - Whisk flour, sugar, baking soda, baking powder, and salt in large bowl. Stir in raisins or currants if using.
03 - Whisk buttermilk, egg, and melted butter in separate bowl until combined.
04 - Pour wet ingredients into dry ingredients. Fold gently with spatula until just combined; do not overmix.
05 - Turn dough onto lightly floured surface. Pat into 1-inch-thick round.
06 - Using floured 2.5-inch cutter, cut scones and place on prepared baking sheet. Gather scraps and repeat.
07 - Bake 16–18 minutes until golden and toothpick inserted in center comes out clean.
08 - Let cool slightly. Serve warm with softened butter.