01 - Preheat oven to 400°F. Line baking sheet with parchment paper or grease lightly.
02 - Whisk together whole wheat flour, all-purpose flour, sugar, baking soda, and salt in large bowl.
03 - Stir raisins into flour mixture until evenly coated.
04 - Whisk buttermilk, egg, and melted butter in separate bowl until combined.
05 - Pour wet ingredients into dry ingredients. Mix with wooden spoon just until combined. Do not overmix.
06 - Turn dough onto lightly floured surface. Gently knead 4 to 5 times until dough comes together. Dough will be sticky.
07 - Shape dough into round loaf and place on prepared baking sheet.
08 - Cut deep X across top of loaf with sharp knife.
09 - Bake 35 to 40 minutes until golden brown and skewer inserted in center comes out clean.
10 - Cool on wire rack at least 30 minutes before slicing.