Stir together flour, sugar, baking powder and spices and set aside. In a large mixing bowl, combine bran flakes, water and pumpkin and let stand for 2 minutes or until cereal softens. Add egg whites and oil. Beat well. Add raisins and stir well Mix in flour mixture stirring until just combined; the batter will be stiff. Portion batter evenly into twelve muffin cups coated with cooking spray. Bake at 400 degrees Fahrenheit until lightly browned. Best served warm for dessert.