Heat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line it with a strip of parchment paper that overhangs on both long sides — that becomes your handle for lifting the loaf out cleanly.
Mash the bananas. In a large bowl, mash the ripe bananas with a fork until mostly smooth, leaving a few pea-sized chunks for texture. You should hear a soft, squishy rhythm as the fruit gives way. You want 1½ cups total.
Add the fat and sugar. Whisk in the melted butter, granulated sugar, eggs, and vanilla until the mixture looks glossy, thick, and fully combined. Stop as soon as it does — you're not making a mousse.
Sift the dry ingredients over the wet. Sprinkle the flour, baking soda, and salt across the top. Fold gently with a rubber spatula, scraping the bottom and corners as you go, until just a few flour streaks remain. Don't worry if the batter looks looser than you expect — that's a good sign, not a mistake.
Scrape into the pan. Smooth the top with a spatula and, if you like, sprinkle turbinado sugar over the surface. It will bake into a crisp, golden crackle that shatters when you slice.
Bake for 55 to 65 minutes. Rotate the pan halfway through so the loaf browns evenly. The bread is done when a skewer inserted in the center comes out with a few moist crumbs clinging to it, or when an instant-read thermometer registers 200°F to 205°F (93°C to 96°C) in the middle.
Cool in the pan for 15 minutes. Then lift it out using the parchment and let it cool completely on a wire rack. I know it's tempting to cut into that golden loaf while it's steaming. Let it rest; the crumb sets properly as it cools, and the flavors have a chance to settle into something deeper.