Separate the egg white and yolk into 2 bowls

Add 3 tbsp of sweetener to the egg white and use an electric mixer to whisk until it forms stiff peaks

Add the vanilla extract and the rest of the sweetener to the egg yolk and whisk

Fold the egg yolk into the egg white mix so that the air is not knocked out

Heat a frying pan on a moderate heat with some butter or oil and pour half the mix into the pan. Once it has browned underneath, flip the pancake over. Once cooked, remove the pancake and repeat using the remainder of the batter