01 - Preheat oven to 350°F. Grease and line a 9-inch square or round cake pan with parchment paper.
02 - In a large mixing bowl, whisk together mashed bananas, eggs, vegetable oil, granulated sugar, light brown sugar, and vanilla extract until smooth and homogenous.
03 - In a separate bowl, whisk together all-purpose flour, baking soda, baking powder, ground cinnamon, and salt until well combined.
04 - Gradually fold the dry ingredients into the wet mixture until just combined. Avoid overmixing to maintain a tender crumb.
05 - Gently fold in chopped nuts or chocolate chips as desired.
06 - Pour the batter into the prepared pan and smooth the top with a spatula.
07 - Bake for 35 to 40 minutes or until a toothpick inserted into the center emerges clean.
08 - Let the cake cool in the pan for 10 minutes before transferring to a wire rack to cool completely. Serve warm or at room temperature.