Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until smooth.

Add the mashed bananas and vanilla extract, mixing until well combined.

Beat in the egg until fully incorporated.

In a separate bowl, whisk together the flour, baking soda, and salt.

Gradually add the dry ingredients to the banana mixture, stirring until just combined.

Fold in the chocolate chips until evenly distributed.

Drop dough by rounded tablespoons onto the prepared baking sheet.

Bake for 10-12 minutes or until the edges are golden brown.

Let the cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.