Preheat the oven to 400°F (200°C) and prepare a baking sheet with parchment paper.

Whisk together the flour, baking powder, sugar, and salt in a large bowl.

Cut in the cold butter using a pastry cutter or your fingers until the mixture looks like coarse crumbs.

Fold in the heavy cream and fresh blackberries gently.

Turn out the dough onto a floured surface and shape it into a circle about 1 inch thick. Cut into wedges and transfer them to the baking sheet.

Bake for 15-20 minutes or until golden brown.