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.
03 - Stir in currants or raisins if using.
04 - In a separate bowl, whisk together buttermilk, egg, and melted butter.
05 - Pour wet ingredients into dry ingredients. Stir with a fork until just combined; do not overmix.
06 - Turn dough onto a lightly floured surface. Gently pat into a circle about 1 inch thick.
07 - Using a floured 2.5-inch round cutter, cut out scones and place on the prepared baking sheet. Gather scraps and repeat.
08 - Bake for 18–20 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
09 - Transfer to a wire rack. Serve warm, split, and topped with softened butter.