01 - Preheat oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - In a large mixing bowl, whisk together the mashed bananas, eggs, melted butter, granulated sugar, brown sugar, and vanilla extract until smooth and well blended.
03 - In a separate bowl, whisk together the all-purpose flour, baking soda, salt, and ground cinnamon until evenly distributed.
04 - Add the dry ingredient mixture to the wet ingredients and gently fold with a spatula until just combined. Avoid overmixing to keep the bread tender.
05 - Gently fold in chopped walnuts, pecans, or chocolate chips if desired, distributing them evenly throughout the batter.
06 - Pour the batter into the prepared loaf pan and smooth the top with a spatula for an even surface.
07 - Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs attached.
08 - Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing into 8 even portions.