In a large bowl, whisk together the flour, sugar, baking powder, and salt.
In a separate bowl, whisk the milk, egg, and melted butter.
Pour the wet ingredients into the dry ingredients and stir until just combined; it is okay if the batter has a few small lumps.
Heat a lightly greased non-stick pan over medium heat.
Pour 1/4 cup of batter for each pancake onto the pan and cook until bubbles form on top, then flip and cook until golden brown.