Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, mash the bananas. Add the rolled oats, blueberries, honey or maple syrup, vanilla extract, cinnamon, and a pinch of salt. Stir until well combined.
Drop spoonfuls of the mixture onto your prepared baking sheet. Flatten them slightly to form cookie shapes.
Bake for 15-18 minutes or until the edges are golden brown.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.