Preheat and grease a waffle iron according the directions.
Cream the butter and sugar. Add the egg yolks and beat until combined.
Alternately add the flour and buttermilk.
In a separate bowl, whip the egg whites to stiff peaks. PRO TIP: For maximum stability and fluffiness, use room-temperature eggs and make sure there is not a trace of fat or egg yolk in the bowl.
When ready to make the waffles, fold in the egg whites and baking powder. The mixture should be light and fluffy.PRO TIP: My pastry chef instructor always advised us to stop folding whipped egg whites into a batter when they are 90% mixed, not 100%. This way, you preserve the aeration and don't overmix, causing the fluffiness to dissolve.
Bake in the waffle iron according to your waffle maker's directions. Serve with warm maple syrup and melted butter.
Disclaimer: Nutrition information is provided for courtesy purposes only, and is an estimate not verified by medical or nutrition experts. Read the full nutrition disclaimer.