Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, whisk together the flour, sugar, baking powder, and salt.
Add the cold, cubed butter and blend until it resembles coarse crumbs.
Gently fold in the blueberries.
In a separate bowl, whisk together the cream, egg, and vanilla.
Pour the wet ingredients into the dry and mix until just combined.
Turn the dough out onto a floured surface and knead gently.
Shape into a circle about 1 inch thick and cut into wedges.
Place on the baking sheet and bake for 20-25 minutes until golden.
Remove from oven and let cool slightly before serving.