Preheat your oven to 350°F. Grab a muffin tin and line it with paper liners. No liners? Just grease it lightly with some oil.
In a big bowl, mix the flour, baking soda, salt, and sugar. Give it a quick stir so everything’s combined.
In another bowl, mash those ripe bananas with a fork. Keep going until they’re mostly smooth—a few lumps are totally fine.
Add the almond milk, vegetable oil, and vanilla extract to the mashed bananas. Stir it all up until it’s nice and blended.
Pour the wet banana mix into the dry flour mix. Gently stir them together until they just come together. Don’t overmix—it makes the muffins tough!
If you’re using walnuts or chocolate chips, toss them in now. Fold them in gently with a spoon.
Spoon the batter into the muffin tin. Fill each cup about 3/4 full so they have room to rise.
Pop the tin in the oven. Bake for 20-25 minutes. Check them by sticking a toothpick in the center—if it comes out clean, they’re done!
Let the muffins cool in the tin for 5 minutes. Then move them to a wire rack to cool off completely.