Preheat oven to 350 degrees.Grease and flour a 9 x 5-inch loaf pan.
Mix brown sugar and cinnamon together in a bowl and set aside.
In the bowl of your stand mixer combine white sugar and butter and beat until smooth. Add eggs one and a time and beat on medium speed until combined. Add the vanilla and mix.
Turn the mixer to low and add flour and baking powder, then milk.
Pour half of the batter into the prepared pan. Cover with half of the apples and sprinkle with half of sugar and cinnamon mixture. Pour the remaining batter over apple layer then top with remaining apples and brown sugar/cinnamon mixture.
Bake for 50 minutes or until toothpick inserted into the center comes out clean.
Cool in pan 10 minutes before transferring to a cooling rack.