Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan with butter or cooking spray.

In a small bowl, combine the light brown sugar and cinnamon thoroughly.

In a large mixing bowl, cream together the white sugar and softened butter using an electric mixer on medium speed until pale and fluffy, about 2-3 minutes.

Add the eggs one at a time, mixing well after each addition, then incorporate the vanilla extract.

In a separate bowl, whisk together the all-purpose flour and baking powder.

Gradually add the flour mixture to the butter mixture, alternating with the milk, starting and ending with flour.

Pour half of the batter into the prepared loaf pan, then layer half of the chopped apples and sprinkle half of the cinnamon-sugar mixture over the apples.

Add the remaining batter, top with remaining apples and cinnamon-sugar mixture, and gently swirl with a butter knife.

Bake for 50 to 60 minutes until golden brown; a toothpick should come out clean.

While the bread cools, whisk together the powdered sugar and milk until smooth to make the glaze.

Drizzle the glaze over the bread once cooled slightly and allow it to set before slicing.