Preheat your oven to 400°F (200°C).
In a large bowl, whisk together flour, sugar, baking powder, and salt.
Add the cold butter, mixing until the mixture resembles coarse crumbs.
Gently fold in the blueberries.
In a separate bowl, combine cream, egg, and vanilla extract.
Add the wet ingredients to the dry ingredients, stirring until just combined.
Turn the dough onto a floured surface and gently knead it a few times.
Pat the dough into a circle about 1-inch thick.
Cut the dough into 8 wedges and place them on a baking sheet lined with parchment paper.
Bake for 20-25 minutes or until golden brown. Allow to cool slightly before dusting with powdered sugar.