In a mixing bowl, whisk together the flour, eggs, milk, water, melted butter, sugar (if using), and salt until smooth. You can also use a blender for a smoother batter.
Let the batter rest for about 30 minutes at room temperature. This allows the gluten to relax and results in a smoother texture.
Heat a non-stick skillet or crepe pan over medium heat. Lightly grease the pan with butter or cooking spray.
Pour about 1/4 cup of batter into the centre of the pan, then quickly tilt and rotate the pan to spread the batter evenly in a thin layer.
Cook the crepe for about 1-2 minutes, or until the edges lightly brown and the surface looks set.
Using a spatula, carefully flip the crepe and cook for 1-2 minutes on the other side until lightly golden.
Transfer the cooked crepe to a plate and repeat the process with the remaining batter, greasing the pan as needed.
Stack the cooked crepes on a plate, covering them with a clean kitchen towel to keep them warm and prevent them from drying out.
Serve the crepes warm with your favourite toppings such as Nutella, fresh fruits, whipped cream, jam, or savoury fillings like cheese, ham, or sautéed vegetables.
Enjoy your delicious homemade crepes!