Preheat oven to 325 degrees Fahrenheit (165 degrees Celsius) and grease a standard 12-cup muffin tin or line with paper liners.
In a large mixing bowl, whisk together the whole wheat flour, baking soda, cinnamon, and salt until well combined.
In a separate medium bowl, whisk the melted coconut oil and maple syrup together until emulsified.
Add the eggs to the wet mixture and beat well, then whisk in the mashed bananas, almond milk, and vanilla extract.
Pour the wet ingredients into the dry ingredients and fold gently with a spatula until just combined; ensure no dry flour pockets remain without overworking the batter.
Distribute the batter evenly among the 12 muffin cups, filling each about three-quarters full.
Bake for 20 to 22 minutes, or until a wooden skewer inserted into the center of a muffin comes out clean.
Remove from the oven and allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.