Preheat oven to 350 degrees. Grease and flour a 9 X 5 inch loaf pan.

Mix brown sugar and cinnamon together in a mixing bowl using an electric mixer until smooth and cramy.

Beat in eggs, one at a time, until incorporated; add vanilla extract and stir until incorporated.

Combine flour and baking powder together in another bowl; stir into creamed butter mixture.

Mix milk into batter until smooth.

Pour half the batter into the prepared loaf pan. Next add half the apples and half the brown sugar cinnamon mixture. Lightly pat/push apple mixture into batter.

Pour the remaining batter over apple layer; top with remaining apples and add more brown sugar/cinnamon mixture.

Bake in a preheated oven until a toothpick inserted in the center of the loaf comes out clean approximately 40 minutes.