01 - Preheat the oven to 350°F. Grease and flour a 9-inch round cake pan or line it with parchment paper.
02 - In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt until evenly distributed. Set aside.
03 - In a large bowl, beat the mashed bananas with granulated sugar, vegetable oil, eggs, milk, and vanilla extract until smooth and well blended.
04 - Gradually fold the dry ingredient mixture into the banana mixture, stirring gently until just combined. Avoid overmixing to keep the crumb tender.
05 - If desired, gently fold chopped nuts or chocolate chips into the batter until evenly dispersed.
06 - Pour the batter into the prepared cake pan and smooth the top with a spatula for an even surface.
07 - Bake for 40 to 45 minutes, or until a toothpick inserted into the center comes out clean.
08 - Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.
09 - Slice and serve plain or topped with your favorite frosting.