In large bowl sift together flour, sugar, baking powder and salt.
In medium bowl put 2 egg yolks, oil and milk. Whisk together
In medium bowl whip 2 egg whites till stiff peaks form.
Add washed blueberries to dry ingredients. Stir the milk mixture into the dry until no dry flour remains. Gently fold the stiffly beaten egg whites into mixture leaving a few fluffs.
Heat waffle maker, lightly spray with Pam and add a soup ladle of batter. Cook for +/- 4 minutes, till golden. Serve hot with butter and Maple syrup. Enjoy.