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

In a bowl, mash the ripe banana.

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

Beat in the egg and vanilla extract, then mix in the mashed banana.

In a separate bowl, combine the flour, baking soda, and salt. Gradually add this to the wet mixture, stirring until just combined.

Fold in the chocolate chips.

Drop spoonfuls of the dough onto the prepared baking sheet.

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

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

Enjoy your cookies warm or freeze them for later!