Separate the egg yolk from the egg white.
In a medium bowl, beat the egg white until stiff peaks form.
In another large bowl, mix the dry ingredients: flour, baking soda, baking powder, cornstarch, sugar, and salt.
Add the wet ingredients: buttermilk, melted butter, egg yolk, and vanilla extract. Stir to combine but leave batter lumpy.
Carefully fold the beaten egg white into the batter just until combined. Let the mixture sit for 30 minutes.
Heat up your waffle iron and cook according to your waffle iron’s directions until golden brown and crispy.
Enjoy immediately with butter and syrup.
