Preheat oven to 350F. Grease and line loaf pan with parchment paper.
Peel and cut your apple into small chunks, set aside.
In a small bowl, whisk brown sugar and cinnamon together and set aside.
In your stand mixer with your paddle attachment on (can be done by hand as well) beat together butter and sugar until light and fluffy, about 2-3 minutes.
Add in eggs and vanilla extract and mix till well combined.
Add the flour and baking powder, mix slightly, add in milk, and mix until everything is combined.
Pour half of the batter in the loaf pan.
Add half the apples on top of the batter and gently press then down. Add half the brown sugar mixture and spread it on top of the apples.
Top with the remaining batter, followed by remaining apples, and brown sugar.
Bake for 55 minutes or until a toothpick inserted in the centre comes out clean.
Cool for 10 minutes in the loaf pan then transfer to a wire rack to cool completely.
