Preheat waffle iron.

Combine all dry ingredients and mix well.

Add milk, egg, oil and vanilla, and mix well to combine. Add enough liquid so that batter makes a small mound or ribbon temporarily before returning to level.

Right before pouring batter onto waffle iron, add vinegar and mix quickly. Make waffles as per the instructions for your specific waffle maker.

Place on a cooling rack immediately after removing from waffle iron.