In a mixing bowl, whisk together the flour and eggs.
Gradually add the milk while continuously whisking to avoid lumps.
Stir in the melted butter, sugar, and salt until smooth.
Let the batter rest for 30 minutes at room temperature.
Heat a non-stick skillet over medium heat and lightly grease it.
Pour about 1/4 cup of batter into the skillet, swirling to coat evenly.
Cook for 1-2 minutes or until the edges lift and the bottom is lightly golden.
Flip the crepe and cook for another 30 seconds until set.
Transfer to a plate and repeat with the remaining batter.
Fill and serve crepes as desired.