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