Preheat your oven to 425°F (220°C).

Line a baking sheet with parchment paper.

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

Add the cold, cubed butter to the dry ingredients and cut it into the flour until it resembles coarse crumbs.

Pour in the milk and vanilla extract and stir gently until just combined.

Carefully fold in the blueberries.

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

Cut out biscuits using a round cutter or a glass.

Place the biscuits on the prepared baking sheet and bake for 15-20 minutes, or until golden brown.