Preheat oven to 350°F. Spray a 9x5-inch loaf pan with nonstick cooking spray. Set aside.
To a medium bowl, add apples, brown sugar, and cinnamon. Mix well to coat the apples. Set aside.
In the bowl of a stand mixer, mix together granulated sugar and butter until light and fluffy, about 2-3 minutes.
Add in eggs, vanilla, and milk. Mix on medium speed until fully incorporated.
Add in flour, baking powder, and salt and mix until just incorporated, scraping the sides of the bowl as needed.
Remove bowl from stand mixer. Fold in ¾ of the apples. (Reserve about ½ cup to pour on top.)
Pour into the prepared loaf pan.
Place remaining apples on top.
Bake for 65-70 minutes, or the internal temperature of the bread is 200°F. If you insert a toothpick it should be removed with crumbs but no wet batter.
Carefully remove the bread from the pan place on a wire rack.