Preheat oven to 350°F (175°C) and line a 12-cup muffin tin with paper liners.
In a large bowl, whisk together the mashed bananas, eggs, vanilla extract, and maple syrup until well combined.
Add the almond flour, baking soda, sea salt, and cinnamon to the wet ingredients.
Stir until the batter is uniform and no dry flour remains.
Divide the batter evenly among the 12 muffin cups.
Bake for 22 to 25 minutes, or until the tops are golden brown and a toothpick inserted into the center comes out clean.
Remove from the oven and let cool in the pan for 10 minutes before transferring to a wire rack.