In a bowl, whip the egg whites using electric beaters until light and fluffy, about 5 minutes.
In another bowl, mix together the almond flour, baking powder, salt and pie spice. Stir in the egg yolks and pumpkin. Starting with a spoonful, carefully gold the pumpkin mixture into the whites, a bit at a time in a figure 8 motion.
Heat and grease your waffle iron and add a generous spoonful to each quarter side. Cook according to your manufacturers directions.
Serve immediately, or top with yogurt, pecans and pumpkin seeds, if desired.