Preheat Oven to 425
In a large mixing bowl combine all dry ingredients (flour, white sugar, baking powder, salt and baking soda) and whisk for 20-30 seconds. Set aside.
In a small bowl lightly beat the egg and set aside.
Grate the butter into the dry ingredients mixing into flour mixture with a spatula to combine. (or use a pastry cutter to work into dry ingredients). Because the butter is cold there will still be butter pieces in the flour and that is completely fine.
Add your lightly beaten egg and mix 2-4 times to be careful not to over mix your batter.
Carefully fold in blueberries.
Add 2/3 cup of milk and combine into mixture with spatula. Add more if the batter is dry and crumbly. If the batter feels moist and sticky then you do not need to add more. Continue adding milk until batter is sticky to the touch.
Once your batter is sticky, dump your batter onto a lightly floured surface (pastry board, cutting board or countertop) and shape into a circle.
Gently roll with rolling pin until the ball of batter is approx. 1.5-2" in height.
Cut batter into triangles (like a pizza) and place on a parchment lined cookie sheet.
Cook for 16-18 mins until top is golden. Allow to sit for 3-5 mins before adding melted butter to the top or easy lemon glaze icing.