For big-topped muffins, line 10-12 standard-size muffin cups with paper liners or butter muffin pan.
Whisk the flour, baking powder, and salt in bowl.
With stand mixer or hand mixer, beat the butter and granulated sugar for about 2 minutes.
Add the eggs one at a time, scraping down the sides of the bowl and beating well after each addition.
Beat in the vanilla extract. (The batter may look a little grainy — that’s okay).
Gradually add the flour mixture, alternating with the milk, beating on low speed to combine.
The batter will be very thick.
Add the blueberries to the batter and fold gently with a spatula until evenly distributed. Do not overmix.
Scoop the batter into the prepared muffin tin; they will be very full.
Sprinkle the turbinado sugar evenly on top of the muffins.
Bake for about 30 minutes, until lightly golden.
Let the muffins cool in the pan for about 20-30 minutes (especially if using silicone muffin pan).
Run a knife around the edge of each muffin to free it from the pan if necessary (the blueberries can stick), then transfer the muffins to a rack to cool completely.