Whisk in cornstarch, salt, caster sugar, baking powder, and ground cinnamon
Add in the cold vegan butter cubes and use a pastry cutter or 2 forks, or your fingers to rub the butter into the flour mixture until it forms pea-size crumble.
Drizzle the soy milk and vanilla extract over the flour mixture and then mix in with a spoon until a rough dough forms.
Add frozen or fresh blueberries and gently knead in the dough.
Pour the dough onto a floured kitchen counter, and work with floured hands.
The dough will be sticky, if it's too sticky add a little more flour on top. If it seems too dry, add 1-2 more tablespoons of soy milk.
Place the dough onto a large floured piece of parchment paper. Sprinkle flour on top of the dough and press into an 8-inch disc and with a sharp knife divide into 8 wedges.
Slide the piece of parchment paper with the disc of scones on a plate and refrigerate for 15 minutes.
Meanwhile preheat oven to 200°C (400°F)
Line a baking sheet with parchment paper.
After refrigerating, separate each scone and place them 2-3 inches apart on the prepared baking sheet.
Brush the top of the scones with 1-2 tablespoons of soy milk and sprinkle coarse cane sugar on top (optional).
Bake for 20-30 minutes or until golden brown and the edges are dry and hard.
Remove from the oven and cool for a few minutes on the baking sheet before transfer to the cooling rack
Store the scones at room temperature for 2 days, wrapped in a towel or in a sealed box.
Refrigerate up to 5 days or freeze in a sealed box. Thaw at room temperature the day before.