Preheat the oven to 375°F. Lightly grease a baking pan or cast iron skillet.
In a large bowl, whisk together the first 7 ingredients: flour, baking powder, baking soda, salt, granulated sugar, raisins, and caraway seeds.
In a separate bowl, whisk together the wet ingredients: the egg, buttermilk, and melted butter.
Quickly and gently stir the wet and dry ingredients together.
Transfer the dough into the lightly greased pan.
Drizzle the top with 1 tablespoon of milk and sprinkle with 1 tablespoon of coarse sugar.
Bake in the preheated 375°F oven for 45 minutes.
Test with a cake tester in the center; when it comes out clean, remove the bread from the oven. Notes:
Do not overmix the dough, or the bread will be tough.