01 - Preheat oven to 375°F. Grease a 24-cup mini muffin pan or line with paper liners.
02 - In a large bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt until evenly blended.
03 - Stir in currants or raisins and caraway seeds, if using, to coat evenly with flour mixture.
04 - In a separate bowl, whisk melted butter, buttermilk, and egg until fully combined.
05 - Pour wet ingredients into dry ingredients. Fold gently with spatula until just moistened—do not overmix.
06 - Divide batter evenly among mini muffin cups, filling each about three-quarters full.
07 - Bake 16 to 18 minutes until tops are golden brown and a toothpick inserted in center comes out clean.
08 - Cool in pan 5 minutes, then transfer to wire rack to cool completely. Serve warm or at room temperature.