Preheat a standard waffle iron.
Separate the egg yolks from the egg whites into two bowls.
Beat the egg whites until they are fluffy with soft peaks. Set them aside.
In another bowl mix the milk, pumpkin, melted butter, and egg yolks and stir them together.
In a large bowl, whisk together the remaining ingredients, the flour, brown sugar, baking powder, cinnamon, pumpkin pie spice, and salt.
Stir the pumpkin mixture into the flour mixture.
Gently fold the beaten egg whites into the mixture with a rubber spatula, until just combined.
Lightly spray the waffle iron with nonstick spray, or brush vegetable oil over the waffle iron.
Add about 1/2 cup of batter to the middle of the waffle iron.
Close the waffle iron and cook the waffle on the preheated iron until crispy and baked through, about 5 minutes.
Serve waffles cooked to order, or place cooked waffles on a baking pan in a 250 Fahrenheit oven to keep warm to serve them all at once.
Serve with your choice of waffle toppings.