Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a large bowl, whisk together flour, sugar, baking powder, and salt. This step ensures everything is evenly distributed.
Add cold butter cubes into the flour mixture. Use a pastry cutter or fork to blend until the mixture looks like coarse crumbs. This is what gives the scones their flaky texture.
Gently fold in the blueberries. Try not to crush them too much at this stage.
In a separate bowl, whisk together heavy cream, egg, and vanilla extract.
Pour the wet mixture into the dry ingredients. Stir gently until just combined. The dough will look slightly rough—that’s perfect.
Turn the dough onto a lightly floured surface. Shape it into a round disk about 1 inch thick.
Cut into 8 equal wedges using a sharp knife.
Place wedges onto the prepared baking sheet, leaving space between each one.
Brush the tops with a little cream and sprinkle coarse sugar if desired.
Bake for 16–18 minutes, or until golden brown on top and slightly firm to the touch.
Let them cool for 10 minutes before serving. Warm is best!