Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan.

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

Beat in the eggs one at a time, then stir in the vanilla extract.

Combine the flour and baking powder in a separate bowl, then gradually add to the butter mixture, alternating with the milk.

Fold in the chopped apples.

In a small bowl, mix the brown sugar and cinnamon.

Pour half of the batter into the prepared loaf pan. Sprinkle half of the cinnamon-sugar mixture over the batter. Repeat with remaining batter and cinnamon-sugar.

Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.

Let the bread cool in the pan for 10 minutes before transferring to a wire rack.

For the glaze, whisk together the powdered sugar and milk until smooth. Drizzle over the cooled bread if desired.