Start by making a flax egg by combining flax meal and warm water in a small bowl and let gel for 5 minutes.
Make buttermilk by combining apple cider vinegar, vanilla extract, and soy milk and let thicken.
In a large mixing bowl, combine all purpose flour, brown sugar, cinnamon, baking powder, salt and stir to evenly mix ingredients.
Cut in vegan butter until you have pea-sized crumbles in the flour. Add soy buttermilk mixture and flax egg to the batter and mix until almost combined.
Add the diced apples and turn over onto a well-floured surface. Shape into a rough oval shape and cut into 10 triangles.
Transfer to a baking sheet and bake for 20 minutes at 375F.
Once golden, remove from oven and let cool on a wire rack,
Meanwhile, combine ground cinnamon, icing sugar, and soy milk to get a glaze. Drizzle over cooled baked scones and let dry for about 20 minutes. Store in an airtight container (these also freeze well).