Preheat your oven to 350°F (175°C) and grease a standard loaf pan with butter or non-stick spray.

Peel and dice your apples into small cubes, combine with dark brown sugar and cinnamon, and drizzle with melted butter.

In a large bowl, cream together the softened unsalted butter, granulated sugar, and dark brown sugar until light and fluffy.

Whisk together the flour, baking powder, and salt in a separate bowl. Mix milk and sour cream until smooth.

Gradually add the flour mixture and milk-sour cream mixture to the creamed butter mixture.

Pour half of the batter into the prepared loaf pan, layer with apple filling, then repeat with remaining batter and filling.

Bake for 50 minutes, checking for doneness at 45 minutes. The bread is ready when golden brown and a toothpick comes out clean.

Prepare the glaze by whisking together powdered sugar, milk, and vanilla extract until smooth.