Prehead oven to 400°F
To a small bowl add oat milk, vanilla extract and aquafaba. Refrigerate until needed
Cut stick of butter into one inch chunks and then place the chunks in the freezer until needed
Add flour, sugar, lemon zest, salt and baking powder to a large bowl mix well.
Once mixed add your butter and mix with clean hands until dough looks like bread crumbs. Nothing too uniform and big chunks of butter are okay. Work fast so your butter does not start heating up
Next add the oat milk, vanilla extract and aquafaba mixture. Mix. Dough should be sticky but not too sticky
Gently fold in blueberries. Put dough in the freezer for 10 mins to get the fats solidified again.
Once 10 minutes is up turn the dough out onto a gently floured surface and pat down into a circle. Don't worry if some of the blue berries get crushed. The circle should be about 1-½ inch thick
Next cut one line down the center then cut another line down the center horizontally till you have 4 triangles. Then cut all those triangles into 2 so you now have 8 triangles. Sprinkle extra sugar on top
Arrange in a circle with tips pointed towards each other on a baking sheet with parchment paper. Bake for 15-20 minutes until a toothpick inserted in the center comes out clean and the tops have golden spots
Let cool for 3-5 minutes and transfer to a wire rack to finish cooling. Best when fresh. To store place in container on the counter for up to a week or can be stored in the freezer and warmed in the oven.