01 - Preheat oven to 375°F. Line a 12-cup muffin pan with paper liners or lightly grease with cooking spray.
02 - In a large mixing bowl, whisk together all-purpose flour, whole wheat flour, granulated sugar, baking soda, baking powder, and salt until thoroughly blended.
03 - In a separate bowl, whisk buttermilk, egg, and melted butter until smooth and well combined.
04 - Pour wet ingredients into dry ingredients. Gently fold together using a spatula just until combined; do not overmix as this will toughen the muffins.
05 - Fold in golden raisins and caraway seeds if using, distributing evenly throughout the batter.
06 - Divide batter evenly among prepared muffin cups, filling each about three-quarters full.
07 - Bake for 18 to 22 minutes until tops are golden brown and a toothpick inserted into the center comes out clean.
08 - Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely. Serve warm with butter, jam, or honey.