01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Whisk together flour, sugar, baking powder, baking soda, salt, and lemon zest in a large bowl.
03 - Incorporate cold, cubed butter into the dry mix using a pastry cutter or fingertips until texture resembles coarse crumbs.
04 - In a separate bowl, whisk heavy cream, egg, vanilla extract, and lemon juice until blended.
05 - Pour wet ingredients into dry mixture and stir gently just until a shaggy dough forms.
06 - Fold in blueberries carefully to distribute evenly without crushing.
07 - Turn dough onto a lightly floured surface and pat into a 7-inch diameter circle about 1 inch thick.
08 - Cut dough into 8 wedges and place on prepared baking sheet, spacing slightly apart.
09 - Lightly brush tops with additional heavy cream.
10 - Bake for 16 to 18 minutes until golden and cooked through. Transfer to wire rack to cool.
11 - Whisk powdered sugar, lemon juice, and lemon zest until smooth and drizzle-able.
12 - Drizzle lemon glaze over mostly cooled scones and allow to set before serving.