Preheat oven to 350 degrees F. Grease an 8×8-inch baking dish with nonstick cooking spray and set aside.

In a large bowl, combine the oats, cocoa, baking powder, and salt. Set aside.

In a medium bowl, combine the milk, mashed bananas, maple syrup, melted coconut oil, eggs, and vanilla extract. Whisk until combined.

Add the milk mixture to oat mixture and stir until combined. Stir in the chocolate chips.

Pour the oatmeal mixture into prepared pan and sprinkle with additional chocolate chips, if desired. Bake for 35 minutes or until oatmeal is set.

Remove from the oven and sprinkle with flaky sea salt, if desired. Cool for 5 minutes before serving. Spoon into a bowl and enjoy!