Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan—or line it with parchment paper if you're into easy cleanups.
In a large bowl, mix the mashed bananas with melted butter. Use a spoon, not a whisk—trust me on this one.
Add the sugar, beaten egg, and vanilla. Stir until it looks like something you’d trust.
Sprinkle in the flour, baking soda, and salt. Mix gently until everything is just combined. No need to overwork it.
Pour the batter into your prepared loaf pan. Scrape the bowl clean—licking the spoon is optional but highly encouraged.
Bake for 50 to 60 minutes, or until a toothpick comes out clean and the top has a golden brown crust that gently cracks when tapped.
Let it cool for a bit in the pan before transferring to a wire rack. Or just slice it warm and call it a win.