Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper.
In a large mixing bowl, mash the bananas until mostly smooth.
Stir in the honey (or maple syrup), egg, and vanilla extract until well combined.
Add the oats, cinnamon, and sea salt. Stir until evenly mixed.
Fold in the chocolate chips or any additional mix-ins.
Scoop about 1 tablespoon of dough for each cookie onto the prepared baking sheets, leaving about 2 inches between each cookie.
Bake for 12–15 minutes, or until the tops are set and the bottoms are lightly golden.
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack.
Enjoy these Banana Oatmeal Cookies warm or at room temperature.