cooking spray 1 cup all-purpose flour 1 cup whole-wheat flour 2 teaspoons ground cinnamon 1 teaspoon baking powder 1 teaspoon baking soda ½ teaspoon salt ½ cup unsweetened applesauce 4 large egg whites 1½ cups buttermilk 1 teaspoon vanilla extract ½ cup old-fashioned (rolled) oats ½ cup packed light brown sugar ½ cup unsalted pumpkin seeds (pepitas), toasted