In a mixing bowl combine the flour, baking powder, salt and sugar. Using a spatula give it a quick mix.
Add the cold butter that you can cut into small pieces or you can use a grater and grate it like I do. Rub the butter into the dry ingredients until you get a crumbly mixture.
Next, add the lemon zest and the blueberries and gently mix all together.
After that, add the bitten egg and the milk. Using a spatula, gently combine all the ingredients until no dry flour remains.
Slightly flour the work surface and dump the dough on top. Gently knead the dough just to bring all the pieces together. Then press the dough into an 8-inch circle.
Transfer the dough onto a baking sheet covered with parchment paper and cut into 8 wedges. Brush the top with half and half and sprinkle with sugar.
Pop the tray into the oven heated to 400 degrees Fahrenheit and bake for 20-25 minutes or until the top is golden-brown. Let them cool.
Whisk the powdered sugar, lemon juice and vanilla extract until smooth. Drizzle it over the scones and enjoy these heavenly good baking treats.