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Preheat your waffle iron.
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Combine the flour and the ingredients through the brown sugar in a mixing bowl. In a separate bowl, stir together the pumpkin, milk and egg yolks. Whip the egg whites in a separate bowl until soft peaks form.
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Stir the flour mixture and the melted butter into the pumpkin mixture until just combined. Gently fold in the egg whites, about one-third at a time, stirring until incorporated. Cook waffles according to manufacturer's instructions.