Sift all the dry ingredients into a large bowl.

Mix all the wet ingredients, except the egg whites in a bowl and lightly whisk to combine.

Beat the egg whites in a separate bowl until stiff peaks.

Add the wet ingredients to the dry and lightly mix until you have a batter. There will still be a few small lumps. Gently fold in the beaten egg whites until just combined. This can be made in advance and stored in the fridge.

Heat a waffle iron and grease or spray it with cooking spray. Cook the waffles until they are done.