Preheat Oven:

Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper. 
Mix Ingredients:

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. 
Shape Cookies:

Drop spoonfuls of the mixture onto your prepared baking sheet. Flatten them slightly to form cookie shapes. 
Bake:

Bake for 15-18 minutes or until the edges are golden brown. 
Cool:

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