Preheat your oven to 350°F (175°C) and prepare an 8½ x 4½ inch loaf pan.
In a medium bowl, whisk together the all-purpose flour, baking soda, and salt until well combined.
In a large mixing bowl, mash the ripe bananas until mostly smooth with some small chunks.
Whisk in the granulated sugar, eggs, melted butter, sour cream, and vanilla extract until fully incorporated.
Gently add the dry flour mixture into the wet ingredients, stirring just until combined.
Pour the batter into the prepared loaf pan and bake for 50 to 60 minutes or until a toothpick comes out clean.