01 - Heat 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 work butter until mixture resembles coarse crumbs.
04 - In a separate bowl, whisk heavy cream, egg, vanilla extract, and lemon juice until combined.
05 - Pour wet ingredients into dry mixture and stir gently until a shaggy dough forms.
06 - Fold in blueberries carefully to distribute evenly without crushing them.
07 - Turn dough onto a lightly floured surface. Pat into a 7-inch round about 1 inch thick. Cut into 8 wedges.
08 - Place wedges on prepared baking sheet, spacing slightly apart. Brush tops with heavy cream.
09 - Bake for 16 to 18 minutes until golden and cooked through. Cool on a wire rack.
10 - Whisk powdered sugar, lemon juice, and lemon zest until smooth and drizzle-able.
11 - Once scones are mostly cooled, drizzle with lemon glaze and allow to set before serving.