In a mixing bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, whisk together the milk, egg, and melted butter.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix.
Heat a griddle or frying pan over medium heat and lightly grease it. Pour ¼ cup of batter for each pancake onto the griddle.
Cook until bubbles form on the surface of the pancakes and the edges look set, about 2-3 minutes. Flip and cook until golden brown on the other side, about 1-2 minutes more.