01 - Preheat oven to 375°F. Grease 24-cup mini muffin pan or line with paper liners.
02 - Whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt in a large bowl.
03 - Stir in currants or raisins and caraway seeds if using, coating evenly with flour mixture.
04 - Whisk melted butter, buttermilk, and egg in separate bowl until fully incorporated.
05 - Pour wet ingredients into dry ingredients. Fold gently with spatula until just combined—avoid overmixing.
06 - Divide batter evenly among mini muffin cups, filling each approximately 3/4 full.
07 - Bake for 16-18 minutes until tops are golden brown and toothpick inserted in center comes out clean.
08 - Let cool in pan for 5 minutes, then transfer to wire rack. Serve warm or at room temperature.