Sieve and mix all dry ingredients and set aside

Separate egg yolk from white. Keep the white aside and add in egg yolk, butter, vanilla and milk. Whisk till it form bubbles.

Add wet ingredients to dry ingredients and mix.

Whisk egg whites till it forms peak. Fold in gently into the batter until well incorporated. Make sure you don't overmix

Allow to rest for 15 minutes. Fry on a non stick pan without adding oil or butter.