01 - Preheat the oven to 350°F. Grease a 9x5-inch loaf pan with butter or cooking spray, then line with parchment paper, allowing overhang on the sides for easy removal.
02 - In a large mixing bowl, whisk together the mashed bananas, melted butter, and granulated sugar until smooth and fully combined.
03 - Add the eggs, whole milk, and vanilla extract to the banana mixture. Whisk until thoroughly incorporated and the mixture is uniform.
04 - In a separate medium bowl, whisk together the all-purpose flour, baking soda, salt, and ground cinnamon (if using) until well blended.
05 - Gently fold the dry ingredients into the wet mixture using a spatula. Mix just until no dry streaks remain—do not overmix as this can result in a dense loaf.
06 - If using walnuts, pecans, or chocolate chips, fold them gently into the batter until evenly distributed.
07 - Pour the batter into the prepared loaf pan. Use a spatula to spread the batter evenly and smooth the top surface.
08 - Bake for 50 to 60 minutes. Begin checking for doneness at the 50-minute mark by inserting a toothpick into the center—it should come out clean or with just a few moist crumbs.
09 - Allow the bread to cool in the pan for 10 minutes. Using the parchment overhang, lift the loaf from the pan and transfer to a wire rack to cool completely before slicing.