In a medium mixing bowl, add the flour and baking powder and whisk to mix together. Set aside with the other bowls.
Add the butter and sugar to a large mixing bowl and beat with a mixer until creamed together, about 3-4 minutes. Beat in the eggs, one at a time, mixing each one individually. Add the vanilla and fully mix everything together.
Add the flour mixture to the butter mixture and stir in with a spatula. After everything is combined, add the milk and fully incorporate it. The mixture will be nice and thick and creamy.
Pour half of the batter into the prepared bread pan, add half of the apples, and then half of the cinnamon brown sugar mixture on top.
Repeat with the rest of the batter, apples, and sugar mixture. Lightly press everything on the top with your spatula.
Bake for 50-55 minutes. Check it with a toothpick and when it comes out clean, the bread is done! Remove from the oven and allow the bread to cool for 10 minutes in the pan. Remove the pan from the oven and allow it to cool for 10 minutes in the pan. Remove the loaf from the pan and cool on a wire rack.