01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, salt, and lemon zest.
03 - Add cold butter cubes and use a pastry cutter or fingertips to incorporate until mixture resembles coarse crumbs with some pea-sized pieces remaining.
04 - In a separate bowl, whisk together heavy cream, egg, vanilla extract, and fresh lemon juice.
05 - Pour wet ingredients into the dry ingredients and stir until just combined, avoiding overmixing.
06 - Gently fold fresh blueberries into the dough.
07 - Turn dough onto a lightly floured surface and pat into a 7-inch round, approximately 1 inch thick.
08 - Cut round into 8 wedges and place on the prepared baking sheet, spacing them apart.
09 - Lightly brush the tops of scones with additional cream.
10 - Bake for 16 to 18 minutes until golden and fully cooked. Transfer to a wire rack to cool.
11 - Whisk powdered sugar, lemon juice, and lemon zest until smooth and slightly pourable.
12 - Drizzle the glaze over cooled scones before serving.