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

In a medium-sized bowl, whisk together the all-purpose flour, baking soda, salt, and ground cinnamon.

In another large bowl, mash the ripe bananas until smooth and stir in the melted butter, brown sugar, granulated sugar, egg, and vanilla extract.

Gradually stir the dry mixture into the wet mixture until just combined.

Fold in any optional mix-ins such as chocolate chips or nuts.

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

Bake for 10–12 minutes until edges are golden brown and centers are set but soft.

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