Preheat oven to 350°F (175°C) and grease a 9×5 inch loaf pan.

In a bowl, whisk together flour, baking powder, and salt.

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

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

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

Gently fold in the chopped apples.

In a small bowl, combine cinnamon and brown sugar.

Pour half of the batter into the prepared loaf pan. Sprinkle half of the cinnamon-brown sugar mixture over the batter. Pour the remaining batter on top and then sprinkle the remaining cinnamon-brown sugar mixture.

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

Allow to cool before slicing.