Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.

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

Cut the cold butter into small cubes and rub them into the flour mixture until coarse crumbs form.

Gently fold in the fresh blueberries, being careful not to crush them.

Add the cold milk and stir until just combined; do not overmix.

Turn the dough out onto a floured surface and pat to 1-inch thickness. Cut out biscuits using a round cutter.

Place the biscuits on the lined baking sheet and bake for 12-15 minutes or until golden brown.

While biscuits are baking, whisk together the glaze ingredients until smooth.

Allow biscuits to cool slightly, then drizzle the glaze over before serving.