Preheat your oven to 350°F (175°C). This ensures that your banana bread bakes evenly and rises properly.

Grease a 9x5 inch loaf pan with butter or non-stick spray to prevent sticking.

In a large mixing bowl, mash the ripe bananas with a fork until smooth. This will provide moisture and flavor to the bread.

Add the sour cream, melted butter, granulated sugar, eggs, and vanilla extract to the mashed bananas. Whisk together until well combined and smooth.

In a separate bowl, whisk together the sifted flour, baking soda, and salt. This helps to evenly distribute the leavening agent and ensures a uniform texture.

Gradually add the dry ingredients to the wet mixture, folding gently with a spatula. Be careful not to overmix; this will keep the bread tender.

If desired, fold in the chopped nuts for added texture and flavor.

Pour the batter into the prepared loaf pan, smoothing the top with a spatula.

Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean. The baking time may vary based on your oven.

Once baked, remove from the oven and let it cool in the pan for 10 minutes before transferring to a wire rack to cool completely.

Slice the banana bread once cooled. It can be enjoyed plain or with butter, and is perfect for breakfast or as a snack.