01 - Set the oven to 400°F and line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, salt, and lemon zest until evenly mixed.
03 - Add cold, cubed butter to the dry mixture and cut in using a pastry blender or fingertips until coarse crumbs form.
04 - Whisk together heavy cream, egg, vanilla extract, and lemon juice in a separate bowl.
05 - Pour wet ingredients into dry mixture and gently fold together until just combined without overmixing.
06 - Carefully fold fresh blueberries into the dough, preserving their shape.
07 - Turn dough onto a lightly floured surface and gently pat into a 7-inch round disk about 1 inch thick.
08 - Slice the disk into 8 equal wedges and arrange them spaced apart on the prepared baking sheet.
09 - Lightly brush the tops of the wedges with additional heavy cream.
10 - Bake for 16 to 18 minutes until golden brown, then transfer to a wire rack to cool.
11 - Whisk powdered sugar with lemon juice until smooth and drizzle over cooled scones.