In a mixing bowl, combine flour, egg and milk, stirring with a wooden spoon to make a smooth batter.
Heat a large frying pan or crepe pan over medium high heat. Lightly grease with butter. Pour about 4 tablespoons of batter into the pan, lift the pan and turn it by rotating your wrist, spreading a paper thin amount over the bottom of the pan. Flip the crepe when it starts to bubble. When it is finished cooking, remove it and repeat this process with the remaining batter.