Using a blender or a whisk, combine the flour, xanthan gum, salt, sugar, melted butter, eggs, milk, and vanilla extract. Blend or whisk the ingredients until no lumps remain.
Then heat a 25 cm ( 10 inch) pan on medium to low heat (1 minute). Add a ½ teaspoon of butter to the pan to prevent the crepe from sticking. Then take ¼ cup of crepe batter and pour it in the middle of the pan. Immediately, tilt the pan to spread the batter. Spread the batter as much as you can.
Cook the crepe for 40 seconds, then flip it using a spatula and cook it for another 30 seconds. Remove the crepe from heat, and serve while it's hot with your choice of filling.
To make Fettuccine crepe, cut 4 crepes into 1 cm strips. Then pour melted chocolate or Nutella on top of the strips. Top it up with ice cream.