Mix flour, sugar, baking powder, and salt in a bowl
Whisk milk, egg, and melted butter in another bowl
Pour the wet ingredients into the dry ingredients
Stir until just combined
Heat a lightly greased skillet or griddle over medium heat
Pour batter onto the hot surface
Cook until bubbles form on the surface
Flip and cook until the other side is golden brown
Repeat with the remaining batter
Serve warm