In a large bowl, whisk together the flour, baking powder, salt, and sugar.
In another bowl, whisk together the milk, egg, and melted butter.
Add the wet ingredients to the dry ingredients and stir until just combined. Do not overmix.
Gently fold in the blueberries.
Heat a non-stick pan or griddle over medium heat.
Drop the batter by 1/4 cupfuls onto the pan.
Cook the pancakes for 2-3 minutes, until bubbles appear on the surface and the edges start to dry.
Flip the pancakes and cook for another 1-2 minutes, until golden brown.