Preheat your waffle iron and coat it with non-stick cooking spray.
In a large bowl, combine the brown sugar with the corn starch.
Add the flour, the baking powder, the pumpkin pie spice, the cinnamon and the salt and mix until everything is combined.
In a separate bowl, combine the pumpkin puree with the egg yolks and the milk, whisking everything together.
Keep whisking while slowly adding the melted butter. Make sure the butter is still warm.
In a separate bowl, beat the egg whites with a hand mixer (on high) until stiff peaks forms. Reserve.
Add the pumpkin mixture to the dry ingredients and mix gently only until combined.
Fold the egg whites in until you can't see them anymore and you have a smooth batter.
Once your waffle iron is ready, pour the batter and cook the waffles. (In my waffle iron it takes 2 to 3 minutes on medium heat!)
Serve it with maple syrup and butter or fresh fruits, chopped pecans, ice cream, whipped cream, honey...Pretty much anything goes with those amazing waffles! :)