1cupmashed ripe banana2 large or 3 medium bananas (see note 1)
⅓cupcanola or olive oil
2 and ¼cupsall-purpose floursee note 2
Preheat oven to 375 degrees F (see note 3).
Make a flaxseed "egg" by combining 1 tablespoon ground flaxseed with 3 tablespoons warm water in a small bowl. Let rest for 5 minutes before using.
Combine all wet ingredients in a medium mixing bowl: mashed banana, flaxseed "egg", soy milk, oil, sugar. Stir together until mostly cohesive.
Add dry ingredients to wet ingredients: all-purpose flour, baking soda, salt, cinnamon, nutmeg. Stir until mostly cohesive. Don't overmix. It is okay if some small lumps remain. The batter should be wet but scoopable. If it is too runny, add ¼ cup flour. If it is took dry, add 2 tablespoons soy milk.
Line a 12 cup muffin tin with liners or lightly spray with cooking oil (I usually just spray instead of using liners). Add ~⅓ cup batter to each cup, evening out as needed.
Bake on the middle oven rack at 375 for 18-20 minutes, or until a toothpick inserted in the center of a muffin comes out clean.
Remove from oven and let rest in muffin tin for 5 minutes before turning out on a wire rack to cool.
Use very ripe bananas. The banana skin should be turning brown or at least heavily speckled (see reference image in post). Use a potato masher or fork to mash the banana until wet and mostly broken down.
Use the spoon and level method to measure flour. Take a spoon and scoop flour into the measuring cup until overflowing. Use the back of a knife to wipe excess flour off the top. Do not pack flour into cup.
I recommend using an oven thermometer. Oven temperatures can vary widely and the only way to know if your oven is the temperature it says it is is to use an oven thermometer.
Flour: These muffins can be made with half whole wheat in place of white wheat. It will yield a slightly denser muffin.
Add-ins: Fold in up to ½ cup chocolate chips, chopped nuts, or your other favorite add-in to the batter.
Sugar: I don't recommend replacing white sugar with maple syrup or any other liquid sweetener. You can add ¼ cup brown sugar in place of ¼ cup white sugar for a richer taste.