Preheat the oven to 350ºF and line a standard muffin tin with 12 paper or silicone liners. Peel the bananas and mash them on a plate with a fork until they look relatively smooth.
In a large mixing bowl, combine the ground flax seed and water and whisk well. (Alternatively, you can replace the flax seed + water with 2 eggs.) Then add in the mashed banana, olive oil, and maple syrup. Mix well.
Add in the buckwheat flour, cinnamon, and baking powder, and stir again. Fold in any extra add-ins you like, such as chocolate chips or walnuts.
Use a ¼ cup to scoop that batter into the lined muffin cups, distributing the batter evenly in the pan. Bake at 350ºF for 22 to 25 minutes, until the muffins rise and the tops have started to crack.
Remove the muffin tin from the oven, and let the muffins cool for at least 30 minutes before serving. Leftover muffins can be stored in an airtight container in the fridge for up to 5 days.
Notes
Nutrition information is for 1 of 12 muffins, without any add-ins. This information is automatically calculated, and is just an estimate, not a guarantee.• This recipe is vegan as-written, but if you prefer a muffin with more protein, you can swap the ground flax seeds and water for 2 eggs, instead. They turn out slightly more fluffy with this swap!• This is not a very sweet muffin, so I highly recommend adding the chocolate chips if you are looking for a sweet treat. My kids love them this way!• You can omit the maple syrup and replace it with a 1/4 cup of water, if you want an even less-sweet muffin made with no added sugar. Note: This recipe was updated in August 2022. You can find the original recipe saved at the bottom of this post!