Combine ground flax and warm water in a small bowl, and let it sit for about 10 minutes to form a gel.
Turn on your waffle iron to heat up.
In a large bowl, whisk together mashed banana, melted coconut oil, sugar, almond milk, vanilla extract. Add the flax mixture, and mix well.
Add the flour, baking powder, salt, and cinnamon. Mix well.
Brush your waffle iron with a bit of coconut oil on the top and bottom. Spoon about 1/4 cup of waffle batter into each square - this will vary depending on the size of your waffle iron.
Close, and cook until your waffle iron indicates the waffles are done - just a couple of minutes each.
Remove waffles from the iron and onto a wire wrack to cool.
Repeat with remaining batter.
Once waffles are cool, place them in a plastic freezer bag separated by squares of parchment or freezer paper.
To reheat, simply pop your waffles into the toaster for a couple of minutes.
Serve with sliced banana, maple syrup, and cocoa nibs if you like.