Place cottage cheese, canned pumpkin, egg yolks, vanilla, and sugar, if using, in a large bowl. Add water, oat flour, cinnamon, pumpkin pie spice, baking powder and salt and mix until mixture is smooth batter.
Beat the egg whites to soft peaks in another medium bowl. Then fold into the batter.
Spray pre-heated mini or standard size waffle iron with oil spray.
Pour batter into iron (about 1/4 cup of mini or ½ cup if larger) and cook until golden brown and steam is no longer being released, about 3 minutes.
Notes
*check labels for gluten-free.Top with maple syrup, agave, almond butter, pumpkin butter, apple butter or honey. Sliced bananas would be a good fruit option.