pumpkin waffles

INGREDIENTS

• 2 1/2 cups all-purpose flour
• 1/3 cup packed light brown sugar
• 2 1/4 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 teaspoons ground cinnamon
• 1 teaspoon ground ginger
• 1/4 teaspoon ground cloves
• 4 large eggs, separated
• 2 cups well-shaken buttermilk
• 1 cup canned solid-pack pumpkin
• 3/4 stick (6 tablespoons) unsalted butter, melted
• Vegetable oil for brushing waffle iron or cooking spray