Preheat oven to 200 degrees and turn on your waffle maker. I make this recipe on the medium high setting but every waffle maker will vary in temperature a little.
Combine all the dry ingredients except the sugar in a large bowl.
Combine the buttermilk, milk, vegetable oil and egg yolk together and whisk together with a fork.
In a medium bowl, beat egg whites with a hand mixer until frothy. Sprinkle in the sugar and beat to stiff peaks.
Pour the wet mixture into the dry ingredients and stir until combined. Fold the egg whites into the batter carefully until completely folded in.
Using a measuring cup or a portion scoop fill the waffle maker with batter and cook until golden brown and crispy. Use a fork to remove from waffle iron.
If you are not eating them immediately place in the oven to keep warm while you finish cooking. Serve with syrup and enjoy.