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

In a mixing bowl, mash the ripe banana until smooth. Add sugar and melted butter, and mix until smooth.

Gradually add flour, baking soda, and salt to the banana mixture. Stir until just combined.

Drop spoonfuls of dough onto the prepared baking sheet, leaving space between each cookie.

Bake for 8-10 minutes or until the edges are golden brown. Let cool before transferring to a wire rack.