Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the mashed bananas and softened butter.
Add the sugar and brown sugar, mixing until well incorporated.
Stir in the egg and vanilla extract until smooth.
In a separate bowl, whisk together the flour, baking soda, baking powder, and salt.
Gradually add the dry ingredients to the banana mixture, stirring until just combined.
If desired, fold in the chocolate chips.
Drop rounded tablespoons of dough onto a baking sheet lined with parchment paper.
Bake for 12-15 minutes or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack.