01 - Preheat the oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
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 together buttermilk, egg, and melted butter until fully combined.
04 - Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined; do not overmix.
05 - Fold in 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 16–18 minutes, or until the muffins are golden and a toothpick inserted into the center comes out clean.
08 - Let muffins cool in the tin for 5 minutes before transferring to a wire rack to cool completely.