Preheat the waffle maker.

Sift the flour, baking powder, and salt into a medium bowl.  In a second bowl whisk together the egg yolks and sugar until the sugar is completely dissolved and eggs have turned a pale yellow. Add the milk, melted butter, and vanilla extract to the eggs and whisk to combine.

Add the flour mixture to the egg-milk mixture and whisk just until blended.  Do not overmix.

In a third bowl, beat the egg whites with an electric mixer until soft peaks form, about 1 minute.

Using a rubber spatula, gently fold the egg whites into the waffle batter.  Do not overmix!

When the green indicator comes on, pour ¾ to 1 cup of the batter onto each grid of the waffle maker. Close, then turn the waffle maker to the other side and let cook for 5 minutes. The waffles should be golden and crisp.  Repeat cooking with remaining batter.   

Serve immediately with toppings of your choice.