Preheat oven to 350 degrees F. Grease a 9x9 inch pan with oil and set aside
In a large bowl, whisk together the mashed banana, egg, vanilla, coconut milk until well combined.
Add the dry ingredients to the wet mixture: oats, baking powder, cinnamon and salt. Mix until combined. Fold in shredded coconut, walnuts, and chocolate chips.
Pour mixture into prepared pan and smooth top. Sprinkle with reserved shredded coconut and chocolate chips. Bake for 35-45 minutes or until the edges are slightly golden brown. Remove from the oven and allow to cool for 10 minutes.