Preheat the Oven: Preheat your oven to 350°F (175°C). Grease your loaf pan with butter or line it with parchment paper.
Mash the Bananas: In a large mixing bowl, mash the ripe bananas with a fork or potato masher until smooth. You should have about 1 ½ to 2 cups of mashed bananas.
Mix Wet Ingredients: In another bowl, whisk together the melted butter, eggs, buttermilk, and vanilla extract until fully combined.
Combine Dry Ingredients: In a separate bowl, sift together the flour, baking soda, and salt.
Combine Wet and Dry Ingredients: Slowly add the dry ingredients to the wet ingredients, stirring gently. Be careful not to overmix; mix just until combined.
Pour into Pan and Bake: Pour the batter into the prepared loaf pan and smooth the top. Bake in the preheated oven for 60 to 70 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Let the banana bread cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely before slicing.