In a large mixing bowl, whisk the flax meal with the water. Set this aside while you gather the rest of the ingredients.
Preheat your oven to 425°F (220°C) and line or lightly grease a muffin tin.
In the large bowl with flax, mash the ripe bananas until smooth and add the rest of the wet ingredients. Mix them until well combined.
Sprinkle all of the dry ingredients over top. Mix the dry and wet ingredients until a thick muffin batter forms.
Scoop a half cup of batter into each of the muffin cups (the batter should dome slightly out of the cups of the tin).
Sprinkle each muffin with about a teaspoon of turbinado sugar and a few oats.
Bake the muffins at 425°F (220°C) for 7 minutes, then decrease the temperature to 350°F (175°C) for 25-27 minutes.
When the muffins have finished baking, remove them from the oven and cool for at least 20 minutes before gently freeing them from the muffin pan.
Store leftover muffins in a bread bag for the first day or two to keep the sugar oat topping crispy. You can keep your muffins in an airtight container at room temperature for up to five days. They will also keep in the freezer for up to 3 months.
Notes
Nutrition facts may vary based on substitutions and brands.