Preheat oven to 350F.
Grease and flour a standard 9x5” loaf pan (or liberally spray with nonstick)
To a small bowl, mix together the brown sugar and apple pie spice and set aside
In a separate medium bowl, toss the chopped apples with the granulated sugar and apple pie spice; set aside.
In a large bowl, beat the butter and granulated together until fluffy
Beat in the eggs and add the vanilla extract.
Whisk together the flour, baking powder, and salt in a separate medium bowl, then add to the wet mixture.
Beat until well combined.
Add in the milk and continue to beat until the batter is smooth.
Pour half the batter into the prepared loaf pan
Add half of the chopped apple mixture
Sprinkle half of the cinnamon and brown sugar mixture on top of the apple layer.
Pour the rest of the batter over the apple layer
Add the remaining chopped apples
Then sprinkle the remaining cinnamon and brown sugar mixture.
Lightly press the apples into the batter and gently swirl the brown sugar mixture through it, using a knife.
Bake at 350F for 50-60 minutes, or until a toothpick inserted into the middle comes out clean and the top is golden brown.
Let the loaf rest in the pan for 15 minutes, then remove and transfer to a wire cooling rack to cool completely.
Whisk the ingredients for the cinnamon glaze together in a small bowl.
Once the loaf is completely cool, drizzle with glaze.