First, preheat your oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan to prevent sticking. In a medium bowl, combine the chopped apples, brown sugar, cinnamon, and ginger. Stir everything together until the apples are evenly coated.
In a large bowl, whisk the room-temperature egg with the granulated sugar. Next, add the vegetable oil, sour cream, and vanilla extract, whisking until the mixture is smooth. In a separate bowl, combine the flour, baking soda, and salt.
Gently fold the dry ingredients into the wet ingredients until just combined; be careful not to overmix. Pour half of the batter into your prepared pan. Spoon half of the apple mixture over the batter, then top with the remaining batter and apples.
Using a knife, gently swirl the batter and apples together a few times to create a marbled effect. Bake for 50-60 minutes, or until a skewer inserted into the center comes out clean. Let the bread cool in the pan before moving it to a wire rack.
While the bread cools, whisk together the sifted powdered sugar, vanilla, and milk in a small bowl until smooth. Once the bread is completely cool, drizzle the glaze generously over the top and let it set before slicing and serving your delicious creation.