Place plantains, egg yolks and coconut oil in blender and blend on high until smooth.Add in vanilla extract, apple cider vinegar, cinnamon and sea salt; blend until well combined. Add in baking soda and blend until well combined.Transfer waffle batter into a large mixing bowl. Set aside.In a small bowl, beat egg whites with baking powder until they start to foam. Fold half of the egg whites into the waffle batter, and then fold in the other half.Heat up your waffle maker and cook per waffle maker instructions. (I cooked our waffles on medium low, for about 4 minutes.)Serve hot with your favorite toppings. Enjoy!