Preheat the Oven: Preheat your oven to 350°F (175°C) and grease or line a 9x5-inch loaf pan with parchment paper.
Prepare the Bananas: Mash the ripe bananas in a large bowl using a fork or potato masher. You should have about 1.5 cups of mashed banana.
Cream the Butter and Sugar: In a separate bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add Eggs and Vanilla: Beat in the eggs, one at a time, ensuring each one is well incorporated. Stir in the vanilla extract.
Combine Dry Ingredients: In a small bowl, whisk together the all-purpose flour, baking soda, and salt.
Mix Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, alternating with buttermilk. Start with the flour mixture and end with the flour, mixing just until combined.
Bake: Pour the batter into the prepared loaf pan, smoothing the top with a spatula. Bake for 60-70 minutes, or until a toothpick inserted in the center comes out clean or with just a few crumbs.
Cool and Serve: Let the bread cool in the pan for 10 minutes before transferring to a wire rack to cool completely. Slice and serve!