Sift all dry ingredients into a bowl and add the sugar. Or not.

In another bowl, whisk egg yolks, milk and melted butter together. Add to the dry ingredients and mix until smooth.

Beat egg whites and fold into the rest of the batter. Allow to stand for 30 minutes.

Spray a waffle pan or waffle machine with some Spray n Cook or cooking spray. Pour batter onto heated plates just enough to cover them, or the base of the pan.

Leave to set slightly before turning over or closing the waffle machine is using one so that both sides are nicely done and / or it is cooked through.

When golden brown, remove and serve immediately.