Peel and cut the plantains into small pieces. Use a knife to cut the peel off if it is hard to remove.
Place plantains, eggs, maple syrup, vanilla, cinnamon, coconut oil, sea salt and baking soda last into a blender. Blend until the batter is smooth.
Preheat the waffle iron. Once hot add a little bit of coconut oil and distribute it evenly with a basting brush. Pour a scoop of the batter into the iron and cook until golden brown and crispy.
Serve immediately or place the waffle on a cooling rack to avoid soggy waffles.