Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt.
Cut in the cold, cubed butter using a pastry cutter until the mixture resembles coarse crumbs.
Gently fold in the blueberries.
In a separate bowl, whisk together the heavy cream, egg, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Turn the dough out onto a floured surface and gently knead it a few times. Pat it into a circle about 1 inch thick.
Cut the dough into 8 wedges and place them on the prepared baking sheet.
Bake for 18-20 minutes, or until the scones are golden brown.
Let the scones cool on a wire rack before serving.