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 distributed.
03 - Stir in the currants or raisins and caraway seeds, if using, to coat them with flour mixture.
04 - In a separate bowl, whisk together melted butter, buttermilk, and egg until well combined.
05 - Pour the wet ingredients into the dry ingredients. Gently fold with a spatula until just combined—do not overmix.
06 - Divide batter evenly among mini muffin cups, filling each about three-quarters full.
07 - Bake for 16-18 minutes, or until tops are golden and a toothpick inserted in the center comes out clean.
08 - Let cool in the pan for 5 minutes, then transfer to a wire rack to cool completely. Serve warm or at room temperature.