01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - Whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt in a large bowl until well blended.
03 - In a separate bowl, whisk buttermilk, egg, and melted butter until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Fold gently with a spatula just until combined; avoid overmixing to prevent tough muffins.
05 - Fold in dried currants and caraway seeds if using until evenly distributed throughout the batter.
06 - Divide batter evenly among prepared muffin cups, filling each approximately 3/4 full.
07 - Bake for 16 to 18 minutes until golden brown and a toothpick inserted into the center comes out clean.
08 - Let muffins rest in the tin for 5 minutes, then transfer to a wire rack to cool completely.