Heat cast iron waffle iron over medium-high heat. Grease liberally!

Separate eggs, beat whites to stiff peaks

Combine egg yolks, sugar, milk, vanilla, and melted butter.

Combine Flour, Baking Soda, Salt in separate bowl.

Slowly fold wet and dry ingredients until just combined.

Fold in egg whites.

Load waffell iron until 3/4 full, close and flip. Turn after 3-5 mins. Grease between each waffle.