Turn on your waffle maker so that it starts to get hot.
Mix all of your dry ingredients in a large bowl. Set aside for later.
In a separate bowl beat the eggs, milk, melted butter, buttermilk, and vanilla until combined.
Combine all the ingredients and stir until just combined. It is ok if the batter is still a little lumpy; an overmixed smooth batter will lead to dense waffles.
Spray your waffle maker with butter spray and pour in 1/2 cup of batter.
Follow the cooking instructions on your waffle iron. I have the Cuisineart Double Waffle Maker and set it on 3 and cook until it beeps.