In a small bowl, whip egg whites with a hand mixer until soft peaks are formed.
In a larger bowl, combine buttermilk, pumpkin, egg yolks, oil and vanilla.
Beat well with a whisk.
Combine flour, brown sugar, baking powder, baking soda, spices and salt in a small bowl and whisk until combined.
Add dry ingredients to buttermilk mixture and whisk until combined and smooth.
Fold in egg whites.
Spoon batter onto hot waffle pan.
* This made 6 round waffles.