Preheat the oven to 350°F (180°C) and spray a 9x5 loaf pan with nonstick spray. Line it with parchment paper so that the parchment paper hangs over the sides, so that when the apple bread is baked, you can easily lift it out of the loaf pan using the parchment paper.
Add the chopped apples to a mixing bowl with the brown sugar and cinnamon and toss together so that all the apple pieces are coated. Set aside.
Sift the all-purpose flour into a mixing bowl, add the cinnamon, nutmeg, baking powder, and salt, and mix. Set aside.
To the bowl of your stand mixer, add the vegan butter and white granulated sugar and cream them together.
Add the vanilla extract and vegan buttermilk and mix in. This mixture will look curdled and lumpy, but don’t worry, this is fine.
Add your dry ingredients to the wet and mix in by hand until combined. Don’t over-mix.
Add the chopped apple mixture and fold in until just mixed.
Transfer to your prepared loaf pan and smooth down.
Bake for 60 minutes or until a toothpick inserted into the center comes out clean.
Lift the apple bread from the pan with the parchment paper overhang and place it onto a wire cooling rack to cool completely.
When your bread has cooled completely, prepare the glaze by adding the powdered sugar and soy milk to a bowl and mixing until smooth.
Drizzle the glaze over the top of the bread and put it in the fridge for 5 minutes to set before slicing.