01 - Preheat oven to 350°F. Grease and line a 9-inch square or round cake pan.
02 - In a large mixing bowl, whisk together mashed bananas, eggs, vegetable oil, granulated sugar, light brown sugar, and vanilla extract until the mixture is smooth.
03 - In a separate mixing bowl, whisk together all-purpose flour, baking soda, baking powder, ground cinnamon, and salt.
04 - Gradually add dry ingredients to the wet mixture, stirring until just combined. Avoid overmixing to ensure a tender crumb.
05 - Gently fold in chopped walnuts or pecans and chocolate chips if desired.
06 - Transfer the batter into the prepared pan and smooth the surface evenly.
07 - Bake for 35 to 40 minutes, or until a toothpick inserted in the center emerges clean.
08 - Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack to cool completely. Slice and serve warm or at room temperature.