A large bowl, mix together flour, salt, baking powder and sugar; set aside.

Preheat waffle iron to desired temperature.
In a separate bowl, beat the eggs.

Stir in the milk, butter and vanilla.

Pour the milk mixture into the flour mixture; beat until blended.
Ladle the batter into a preheated waffle iron. Cook the waffles until golden and crisp. Serve immediately.