Step 1: Preheat your oven to 350°F (175°C). Lightly grease and flour a loaf pan.

Step 2: In a small bowl, mix together the brown sugar and ground cinnamon. Set aside for layering.

Step 3: In a large bowl, beat together the softened butter and white sugar until the mixture is light and fluffy.

Step 4: Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

Step 5: In another bowl, whisk together the all-purpose flour and baking powder. Gradually add this dry mixture to the wet ingredients, alternating with the milk. Stir until just combined.

Step 6: Gently fold in the chopped apples, being careful not to overmix the batter.

Step 7: Pour half of the batter into the prepared loaf pan. Sprinkle half of the cinnamon sugar mixture over the batter. Repeat with the remaining batter and cinnamon sugar. Use a knife to gently swirl the layers together.

Step 8: Bake in the preheated oven for 50–60 minutes, or until a toothpick inserted into the center comes out clean.

Step 9: Allow the loaf to cool in the pan for about 10 minutes before transferring it to a wire rack.

Step 10: In a small bowl, whisk together the powdered sugar and milk to create a glaze. Once the loaf is completely cool, drizzle the glaze evenly over the top.