In a large bowl, whisk together flour, eggs, milk, melted butter, sugar, vanilla, and salt until smooth.
Let the batter rest for 20–30 minutes.
Heat a skillet over medium heat and lightly butter.
Pour about ¼ cup batter into the pan, swirling to coat evenly.
Cook for 30–45 seconds per side, just until set (no browning).
Stack crêpes on a plate and cool completely.