Heat the oven to 250 degrees.
Combine the dry ingredients in a large mixing bowl.
Whisk together the egg yolks, milk, melted butter, honey and pumpkin in a medium-sized bowl.
Beat the egg whites in a small bowl until stiff and set aside.
Heat your waffle iron.
Add the liquid ingredients to the dry ingredients, stirring until combined.
Brush the waffle iron lightly with oil.
Spoon in the batter (about 1/4 cup - 3/4 cup per waffle), spreading quickly. Cook according to your waffle iron's instructions.
Transfer waffles to a rack in the oven to keep them warm and crisp. (I put a baking rack on a cookie sheet for this.)
Repeat for the remaining batter. Serve waffles while still hot.