01 - Preheat oven to 375°F. Grease 24-cup mini muffin pan or line with paper liners.
02 - In large bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt.
03 - Stir in currants or raisins and caraway seeds, if using, to coat with flour mixture.
04 - In separate bowl, whisk melted butter, buttermilk, and egg until well combined.
05 - Pour wet ingredients into dry ingredients. Gently fold with spatula until just combined—do not overmix.
06 - Divide batter evenly among mini muffin cups, filling each about 3/4 full.
07 - Bake 16–18 minutes until tops are golden and 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.