Combine the apple cider vinegar with almond milk, mix it together and set it aside.
Combine all dry ingredients (almond flour, tapioca starch, coconut sugar, and baking powder). Stir until there are no lumps and everything is well-combined.
Preheat waffle iron according to manufacturer's instructions.
Add the remaining ingredients to the dry mix. Pour in almond milk mixture and whisk together until smooth. Avoid over-mixing.
Grease the waffle iron with cooking spray or coconut oil, if needed. Using a ladle or measuring cup, pour batter into the waffle iron (you will need just under ½ cup of batter for most waffle irons). Cook according to the waffle iron manufacturer's instructions. Repeat until all the batter is gone.
Serve immediately, or freeze and reheat in the toaster or oven.