In a large bowl, whisk together the
flour, cinnamon, sugar and ½ tsp salt.
In a jug, whisk the egg, milk, vanilla and
melted butter. Make a well in the dry
ingredients and pour in the milk mixture
gradually, whisking as you go to make
a smooth batter. Ideally, let the mixture
stand for 1 hr (or even overnight, covered
in the fridge), although you can cook
with it straight away.