Put the mashed potato into a mixing bowl with the egg yolk and both of the flours.
Whisk to form a smooth paste by adding a little of the milk at a time.
Season with salt, pepper and nutmeg.
Whisk the egg white until stiff then fold into the mix.
Rub a little oil over the base of a non-stick, or your favourite, pancake pan then gently heat it.
Pour an eig