Clarified butter or vegetable oil, for greasing skillet
In a bowl whisk together flour, sugar, salt, eggs, milk and butter until smooth. Let batter sit 30 minutes before using.
Heat a 7-inch skillet, preferably nonstick, over medium-high heat and brush with clarified butter or oil. Swirl 3 tablespoons of batter over bottom of pan, tilting to spread evenly. Cook until center is set and edges are lightly browned, 1 to 2 minutes. Use a thin spatula to turn crepe and brown second side 30 seconds. Slide crepe out onto a plate. Repeat with remaining batter, stacking crepes as you finish them.