In a large mixing bowl, combine the dry ingredients.
In a second mixing bowl, beat the egg whites until soft peaks form.
Make a well in the middle of the dry ingredients and add the milk, pumpkin, egg yolks, and oil and whisk to combine the wet ingredients. Gradually whisk in the dry ingredients just until moistened.
Fold in the beaten egg whites. Spray the griddle with cooking spray.
Pour the batter by ¼ cupfuls onto the hot griddle. Flip the pancakes when bubbles form on top. Cook until the second side is golden brown. Serve hot.