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