Step 1

Preheat oven to 200 degrees F. Heat waffle maker to highest setting.

Step 2

Mix the flour, cornstarch, baking powder, salt and sugar using a whisk to combine well.

Step 3

Beat the egg yolk with a whisk until smooth.  Stir in the milk, vanilla, and butter.

Step 4

Combine the milk mixture with the dry ingredients. Stir until mostly smooth.

Step 5

Beat the egg whites until stiff peaks form using an electric mixer or blender.

Step 6

Carefully but thoroughly fold the egg whites into the batter. Cook waffles according to waffle maker instructions.

Step 7

Place waffles directly on the oven racks until ready to serve. (And don't stack them!)