01 - Preheat your oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - In a large bowl, whisk together the whole wheat flour, all-purpose flour, sugar, baking soda, and salt.
03 - Stir in the raisins to coat them evenly with flour.
04 - In a separate bowl, whisk together the buttermilk, egg, and melted butter.
05 - Pour the wet ingredients into the dry ingredients. Mix with a wooden spoon or spatula until just combined; do not overmix.
06 - Turn the dough out onto a lightly floured surface. Gently knead 4–5 times to bring the dough together, then shape into a round loaf and place on the prepared baking sheet.
07 - Using a sharp knife, cut a deep X across the top of the loaf.
08 - Bake for 35–40 minutes, or until the bread is golden brown and a skewer inserted in the center comes out clean.
09 - Cool on a wire rack for at least 30 minutes before slicing.