In bowl, with wire whisk, stir flour, sugar, baking powder, and salt. Add milk, butter, and egg and stir until flour is moistened.
Heat griddle or 12-inch skillet over medium heat until drop of water sizzles; brush lightly with oil. Pour batter by scant 1/4 cups onto hot griddle, making a few pancakes at a time. Cook until tops are bubbly, some bubbles burst, and edges look dry. With wide spatula, turn and cook until underside is golden. Transfer to platter; keep warm.
Repeat with remaining batter, brushing griddle with more oil if necessary.