In a small bowl, sift together the flour, baking powder, and sugar and set aside. 

Using two bowls, separate the eggs, placing the egg whites in one of them and the yolks in the other. Set aside the egg whites bowl. 

Add in the milk, butter and vanilla to the egg yolks and stir using a rubber spatula, and set aside.

Stir in the flour mixture, little by little and keep stiring from the outside in after each addition until it is all well incorporated. 

Add the salt to the egg whites and beat using a mixer for about 5 minutes to medium speed, or until the egg whites turn fluffy and white.

Now, incorporate a third of the egg whites to the mixture and then mix in the rest. 

Place a pan on the stove to medium heat for 5 minutes. 

Cook the hot cakes on the pan with butter.