01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt. Stir in currants or raisins if using.
03 - In a separate bowl, whisk together buttermilk, egg, and melted butter until well combined.
04 - Add wet ingredients to dry ingredients. Stir gently with a fork or spatula until just combined; do not overmix—the dough will be shaggy.
05 - Turn dough out onto a lightly floured surface. Pat into a circle about 1 inch thick.
06 - Cut into 8 wedges and transfer to the prepared baking sheet, spacing scones slightly apart.
07 - Optionally, brush tops with a little extra buttermilk for shine.
08 - Bake for 18–22 minutes, or until scones are golden brown and a toothpick inserted into the center comes out clean.
09 - Cool slightly before serving warm with butter and jam.