Preheat the Oven
Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan with butter or non-stick spray, and line it with parchment paper for easy removal.
Mix the Dry Ingredients
In a medium bowl, whisk together the flour, baking soda, salt, and cinnamon. Set aside.
Mash the Bananas
In a large mixing bowl, mash the ripe bananas using a fork until smooth. The riper the bananas, the sweeter and more flavorful your bread will be.
Combine Wet Ingredients
To the mashed bananas, add the melted butter, brown sugar, eggs, vanilla extract, and sour cream (or Greek yogurt). Whisk everything together until well combined.
Incorporate Dry Ingredients
Gently fold the dry ingredients into the wet mixture using a spatula. Be careful not to overmix—just stir until the flour disappears.
Add the Chocolate Chips
Fold in the chocolate chips, reserving a handful to sprinkle on top of the batter.
Bake the Banana Bread
Pour the batter into the prepared loaf pan, spreading it evenly. Sprinkle the reserved chocolate chips on top for an extra chocolatey finish. Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out with just a few moist crumbs. If the top browns too quickly, loosely cover it with aluminum foil for the last 15 minutes of baking.
Cool and Serve
Let the banana bread cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely. Slice and enjoy!