Preheat the oven to 400 degrees F, and line a large baking sheet with parchment paper.
Combine your chia seeds and water in a small bowl or cup to make your chia egg. Let sit for 5 minutes.
In a large bowl, whisk together the flour, baking powder, salt, and brown sugar.
Add the cold vegan butter (the colder the better). Use a pastry cutter or your hands to break up the butter and disperse throughout the dry ingredients. Be careful not to overwork.
Add in the milk, vanilla, and chia egg, and stir until just combined. Fold in the blueberries.
If you dough seems too sticky/soft to work with, let it rest in the fridge for at lease 30 minutes or longer if very soft.
On a lightly floured surface, knead the dough just enough until it comes together. Flatten by hand (lightly flour your hands if sticky) into a rough circle about 1 inch thick. If the dough is too sticky, you'll have to shape scones by hand (what I did).
Using a pizza cutter or sharp knife, cut the dough like a pizza, forming 8 triangles. If shaping by hand, divide dough into 8-9 pieces. Shape each piece into a rough triangle (mine looked more like raindrops and that is a.o.k.).
Place the scones onto the prepared baking sheet and bake for 22-26 minutes, until lightly golden brown on top. (I ended up with 9 scones and 26 minutes was perfect.)