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