01 - Preheat the oven to 375°F. Grease a 24-cup mini muffin pan thoroughly or line with paper liners.
02 - In a large mixing bowl, whisk together all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt until uniformly blended.
03 - Stir in the currants or raisins and caraway seeds, if using, to coat them evenly with the flour mixture.
04 - In a separate bowl, whisk the melted butter, buttermilk, and egg until completely smooth and well combined.
05 - Pour the wet ingredients into the dry ingredients. Fold gently with a spatula until just barely combined—stop as soon as no dry flour remains visible.
06 - Divide the batter evenly among the mini muffin cups, filling each approximately three-quarters full.
07 - Bake for 16 to 18 minutes, until the tops are golden brown and a toothpick inserted into the center of a muffin comes out clean.
08 - Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely. Serve warm or at room temperature.