Preheat oven to 350 degrees F. Grease an 8x8-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, maple syrup, melted coconut oil, eggs, and vanilla extract. Whisk until combined.
Add the milk mixture to oat mixture and stir until combined. Gently stir in the shredded zucchini and 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 cool for 5 minutes before serving. Spoon into a bowl and enjoy!
Notes
I like to use Dutch processed cocoa, but unsweetened cocoa powder works well too. You can double the recipe and bake in a 9x13-inch pan. Store in airtight container in the fridge for up to 5 days.