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