In a medium sized bowl, add the sugar and zest the lemon. Massage the sugar and lemon zest together to release the oils from the lemon. This helps bring out the lemon flavor and evenly distribute the lemon zest throughout the scones.
1 lemon, ½ c granulated sugar
Add the flour, baking powder, and salt to the bowl and mix until well combined.
2 c all-purpose flour, 2 teaspoon baking powder, ¼ teaspoon salt
Using a grater, grate the cold butter into the flour mixture. Alternative, you can cut it into small cubes. With your fingers or a pastry blender, cut the butter into the flour mixture until it resembles the texture of course sand.
½ c unsalted butter
Make a well in the center of your flour mixture and add the sourdough discard, egg, vanilla extract and heavy cream. Mix until the dough is formed together.
½ c sourdough discard, 1 large egg, 2 teaspoon vanilla extract, ¼ c heavy cream
Turn the dough out onto a lightly floured surface and shape into a ball. Pat the dough down into a disc about ½ thick and sprinkle the blueberries on top. Roll the dough into a log. Roll the log along the long edge so it closely resembles a ball. Pat the dough down again into an approximately 8-inch round disk. Cut the disc into 8 wedges. Transfer to a baking sheet lined with parchment paper and place in the refrigerator for about 30 minutes or overnight if you prefer.
1 c blueberries
Preheat the oven to 400℉. Brush the scones with heavy cream and bake in the oven for 20-25 minutes or until golden brown. Allow to cool on the baking sheet for a couple of minutes before transferring to a cooling rack.
To make the lemon glaze, juice your lemon into a bowl and add the powdered sugar. Whisk until smooth. Top the baked scones with the glaze and enjoy!
2 tablespoon lemon juice, 1 c powdered sugar