01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan or line with parchment paper.
02 - In a large bowl, whisk together mashed bananas, eggs, oil or butter, yogurt or sour cream, sugar, and vanilla extract until fully incorporated.
03 - In a separate bowl, sift together flour, baking soda, salt, and cinnamon until well blended.
04 - Gently fold dry ingredients into wet mixture, mixing just until incorporated. Avoid overmixing to prevent tough texture.
05 - Stir in nuts and/or chocolate chips if desired until evenly distributed throughout batter.
06 - Pour batter into prepared loaf pan and smooth top evenly with spatula.
07 - Bake for 50-60 minutes until toothpick inserted in center comes out clean or with few moist crumbs, not wet batter.
08 - Let cool in pan for 10 minutes, then transfer to wire rack to cool completely before slicing.