Preheat the oven to 425°F (220°C).

In a mixing bowl, whisk together the flour, baking powder, sugar, and salt.

Cut in the cold butter using a pastry cutter until the mixture resembles coarse crumbs.

Gently fold in the blueberries.

Add the milk and stir until just combined, being careful not to overmix.

Turn the dough out onto a floured surface and pat it into a rectangle about 1 inch thick.

Cut out biscuits using a round cutter and place them on a baking sheet lined with parchment paper.

Bake in the preheated oven for 15-20 minutes or until golden brown.

Remove from the oven and let cool slightly before serving.