Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or lightly grease it.
In a mixing bowl, combine mashed bananas, applesauce, avocado oil, and vanilla extract. Mix until well combined.
To your wet ingredients add in the oats, flour, baking powder, baking soda, and salt. Mix until just combined.
Gently fold in the blueberries into the cookie dough.
Drop spoonfuls of dough onto the prepared baking sheet, spacing them slightly apart. Flatten each cookie slightly with the back of a spoon or your fingers.
Bake for 12-15 minutes, or until the cookies are lightly 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.
Serve and enjoy!