Preheat the 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.

In another bowl, combine the milk, melted butter, and egg. Mix well.

Pour the wet ingredients into the dry ingredients and stir until just combined. Gently fold in the blueberries.

Drop spoonfuls of the batter onto the prepared baking sheet, spacing them about 2 inches apart.

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

Remove from the oven and let cool slightly before serving.