In a large bowl, whisk together the dry ingredients.
In a large measuring cup, whisk the wet ingredients together. Pour the wet mixture into the dry ingredients and mix until just combined. Set aside.
In another bowl, using a hand-mixer, beat the egg whites until foamy. Add the sugar and continue beating until stiff, glossy peaks form. Fold the egg whites into the batter until just combined.
Cook the batter according to your waffle iron’s instructions. Top waffles with a dusting of powdered sugar, a sprinkling of poppy seeds and a few slices of winter citrus.