01 - Preheat oven to 400°F. Line a 12-cup muffin tin with paper liners or lightly grease the cups.
02 - In a large bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt until well blended.
03 - In a separate bowl, whisk buttermilk, egg, and melted butter until smooth and fully incorporated.
04 - Pour the wet ingredients into the dry ingredients. Stir gently until just combined; do not overmix as this will toughen the muffins.
05 - Fold in the currants and caraway seeds, if using, until evenly distributed throughout the batter.
06 - Divide the batter evenly among the muffin cups, filling each about 3/4 full.
07 - Bake for 16 to 18 minutes, or until the tops are golden brown and a toothpick inserted in the center comes out clean.
08 - Allow muffins to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.