Preheat oven to 200ºC / 390ºF. Grease and flour a muffin tin or use paper liners.
In a large bowl, combine flour, sugar and baking powder. Add milk, eggs (one at a time) and melted butter. Mix to combine, and fold in the blueberries.
Spoon the batter into the muffin cups ¾ full. Optional: sprinkle with sugar over the top. Bake for 20 minutes or until golden brown.