In a medium mixing bowl, mash the banana with a fork and stir in the chia seeds. Now stir in vanilla, almond milk, and water and allow it to thicken for about 5 minutes. Stir in the salt, protein powder, gluten-free flour, and baking powder. Lastly stir in the cider vinegar and allow the bater to thicken while heating the waffle iron.
Heat a waffle iron and pour in batter according to package instructions. Note that these waffles might require a bit more time than other similar recipes.