In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Add the cubed butter to the flour mixture and cut the butter into the flour using a handheld pastry cutter or your hands, until the mixture resembles small crumbs.
In another bowl, whisk together the egg and milk.
Add the egg mixture to the flour and stir until just combined. You will have a shaggy dough mixture, that holds together when pressed with your hands.
Turn the dough out onto a lightly floured surface and knead a few times to pull the dough together. Flatten out the dough and add the blueberries, folding them into the dough. Shape the dough into a round, flattened 8 inch disc. Cut the dough into 6 equal pieces in triangle pie shapes.
Select Bake and set the time and temperature 350F and bake for 18 minutes. Press Start.
Once preheated, spray cooking oil into the basket and then add the scones into the basket, leaving a 1 inch space in between each piece.
When cooking time is completed, carefully remove the scones, and let cool for 30 minutes before adding the glaze.
In a bowl, mix the powdered sugar and lemon juice until smooth. Drizzle over top of the scones and serve.