Preheat oven to 350°F (175°C). Grease a standard loaf pan (8×4 or 9×5 inches).
In a medium bowl, toss chopped apples with brown sugar, cinnamon, and ginger. Set aside.
In a large bowl, whisk the egg, granulated sugar, oil, sour cream, and vanilla until smooth.
In a separate bowl, combine flour, baking soda, and salt. Gradually mix it into the wet ingredients until nearly combined.
Fold in ¾ of the apple mixture. Pour the batter into your prepared pan.
Top with the remaining apple mixture. Tap the pan gently to release air bubbles.
Bake for 50–55 minutes, or until a toothpick inserted in the center comes out clean.
Cool in the pan for 30 minutes before transferring to a wire rack.
For the glaze: whisk powdered sugar, vanilla, and milk until smooth. Drizzle over the cooled loaf just before serving.
