In the bowl of your mixer, combine the pumpkin and 2 egg yolks. Beat in the sugar, butter, cinnamon and ginger. Combine the flour and baking powder and stir into the mixture. Stir in the skim milk. Beat the egg whites until stiff, and fold into the mixture. Spoon into a preheated waffle iron and bake until crisp. Makes 8 – 4 inch by 4 inch waffles. Serving size is 2 waffles.