Get your oven heating to 350°F and thoroughly grease a 9x5-inch loaf pan with butter or cooking spray. Don't skip the corners — banana bread loves to stick.
Place your bananas in a large mixing bowl and mash them with a fork until mostly smooth. A few small lumps are fine — they'll add texture to the finished bread.
Stir the melted butter into the mashed bananas, followed by the sugar, egg, and vanilla. Mix until everything is well combined and the mixture looks uniform.
Combine the flour, baking soda, and salt in a separate bowl, whisking to distribute the leavening evenly. This prevents pockets of baking soda that could leave a metallic taste.
Add the flour mixture to the banana mixture and fold together with a wooden spoon just until you can't see any streaks of flour. Stop mixing as soon as it comes together — overworking will make the bread tough.
Scrape the batter into your prepared loaf pan and spread it evenly with a spatula. The surface doesn't need to be perfectly smooth.
Bake for 55-65 minutes, until the top is golden brown and a toothpick inserted into the center comes out with just a few moist crumbs. The bread will pull slightly from the sides of the pan when done.
⏱ 1 hr
Let the bread cool in the pan for 10 minutes — this prevents it from falling apart when you remove it. Then turn it out onto a wire rack to cool completely before slicing.
⏱ 10 min