In a separate bowl mix the flour, baking powder, pumpkin pie spice, and salt. Add the flour mixture to the wet ingredients and stir until just combined.
In the bowl of an electric mixer fitted with the whisk attachment, whisk the egg whites until white and fluffy with soft peaks, about 8 to 10 minutes set on medium-high speed.
Scoop about 3/4 cup of waffle batter out and pour onto the prepared waffle iron. Cook each waffle for about 3 minutes or using the medium-high setting.