Preheat the oven to 350°F (175°C). Grease a 9-inch pie plate.

Spoon 1 tablespoon buttermilk into a small bowl. Pour remaining buttermilk into a medium bowl.

Stir 1 tablespoon melted butter into buttermilk in the small bowl until combined. Stir golden raisins into buttermilk in the medium bowl. Let both bowls sit until needed.

Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl. Add remaining melted butter and mix until coarse crumbs form.

Add egg and mix until thoroughly combined.

Add buttermilk-raisin mixture to flour mixture, shaping into a ball. Transfer to prepared pan and form into a slightly domed shape.

Slice a crisscross in the top of the dough and brush buttermilk-butter mixture over the loaf.