Preheat oven: to 350 degrees. Grease a 9 x 5 pan with nonstick cooking spray. Make apple filling: Add brown sugar, cinnamon and apples to a medium bowl and toss to coat.
Cream butter and sugar: In a stand mixer with the paddle attachment for 2-3 minutes, or until lighter in color and fluffy.
Add in eggs and vanilla: and mix until combined.
Combine dry ingredients: Whisk together flour, salt, baking powder and nutmeg in a medium bowl.
Add dry ingredients: To the stand mixer on low speed then add in the milk.
First layer: Pour half of the batter into the greased loaf pan.
Second layer: Top with half of the apple mixture.
Third layer: Pour the remaining half of the batter on top.
Fourth layer: Sprinkle with the remaining apple mixture.
Bake: For 50-60 minutes or until the bread is golden brown and set and a toothpick comes out mostly clean.Allow bread to cool for 30 minutes in the pan before removing it to a wire rack to cool completely.
Make the glaze: Combine powdered sugar and milk in a small bowl. Drizzle over cooled bread and serve!