Preheat the Oven:
Preheat oven to 375°F (190°C). Line a large baking sheet with parchment paper.

Mix the Dry Ingredients:
In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
Shred the cold butter directly into the flour mixture. Toss to coat and incorporate evenly.

Make the Dough:
In a separate bowl, whisk together buttermilk and egg.
Pour into the flour mixture and stir until mostly combined. Add raisins and gently mix.
Turn the dough out onto a lightly floured surface and knead briefly (about 30 seconds) until it comes together.

Shape & Score:
Shape dough into a round loaf and place on the prepared baking sheet.
Use a serrated knife to score a deep “X” on top.

Add the Glaze:
Mix melted butter and buttermilk, then brush generously over the loaf.
Sprinkle lightly with sugar.

Bake:
Bake for 40–45 minutes, or until golden and a toothpick inserted in the center comes out clean.
If browning too quickly, tent loosely with foil. Cool slightly before serving.