01 - Preheat the oven to 400°F. Line a 12-cup muffin tin with paper liners or lightly grease with butter.
02 - In a large bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, salt, and caraway seeds if using.
03 - In a separate bowl, whisk together buttermilk, egg, and melted butter until fully incorporated and smooth.
04 - Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined—do not overmix as this will make muffins tough.
05 - Fold in the currants or raisins 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 a toothpick inserted into the center of a muffin comes out clean.
08 - Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.