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, salt, and lemon zest until evenly distributed.
03 - Add cold, cubed butter to the dry mixture and cut in using a pastry blender or fingertips until the texture resembles coarse crumbs.
04 - In a separate bowl, whisk together heavy cream, egg, vanilla extract, and lemon juice until fully combined.
05 - Pour wet ingredients into dry ingredients and gently mix until just combined; avoid overmixing to maintain tenderness.
06 - Carefully fold fresh blueberries into the dough to prevent crushing.
07 - Turn the dough onto a lightly floured surface and pat into a 7-inch round, about 1-inch thick.
08 - Cut the round dough into 8 equal wedges and arrange them spaced apart on the prepared baking sheet.
09 - Lightly brush the tops of the scones with extra heavy cream.
10 - Bake for 16 to 18 minutes or until scones are golden brown and cooked through. Transfer to a wire rack to cool.
11 - Whisk powdered sugar with lemon juice until smooth, then drizzle over cooled scones.