Make the Batter: In a bowl, whisk flour, eggs, milk, melted butter, salt, and vanilla until smooth. Let it rest for 15–20 minutes.
Heat the Pan: Warm a non-stick pan over medium heat. Lightly grease it with butter or oil.
Cook the Crepes: Pour a small ladle of batter into the pan. Swirl to coat evenly. Cook 1–2 minutes, flip, then cook another 30 seconds. Repeat for all crepes.
Add the Topping: Sprinkle sugar over each warm crepe. Squeeze lemon juice on top.
Serve: Fold or roll the crepes. Serve with extra lemon wedges on the side.