Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners or lightly grease it.
In a large bowl, mash the bananas with a fork until mostly smooth. A few lumps are fine—it’s not a beauty contest.
Stir in the melted butter until combined, then add sugar, egg, and vanilla. Mix until it looks like a smoothie you’d never drink.
Sprinkle in the baking soda and salt, stir gently. Then fold in the flour until just combined. Don’t overmix—we’re making muffins, not tires.
Toss in those chocolate chips and give a couple of folds to spread the love.
Spoon the batter evenly into the muffin cups, about 3/4 full. They need a little room to puff up.
Bake for 18-20 minutes, or until a toothpick comes out clean (unless you hit a chocolate chip—then try another spot).
Let them cool for 5 minutes before removing. Or don’t. I’ve burned my tongue plenty and regret nothing.