01 - Preheat the oven to 375°F. Line a 12-cup muffin pan with paper liners or lightly grease with cooking spray.
02 - In a large bowl, whisk together the all-purpose flour, whole wheat flour, sugar, baking soda, baking powder, and salt until thoroughly blended.
03 - In a separate medium bowl, whisk the buttermilk, egg, and melted butter until fully combined and smooth.
04 - Pour the wet ingredients into the dry ingredients. Gently fold together using a rubber spatula until just combined; do not overmix as this will result in tough muffins.
05 - Fold in the golden raisins and caraway seeds if using, distributing evenly throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Bake for 18-22 minutes, or until a toothpick inserted into the center comes out clean and the tops are golden brown.
08 - Allow the muffins to rest in the pan for 5 minutes, then carefully transfer to a wire rack to cool completely.