Preheat oven to 190°C. And spray 8-inch square baking dish with cooking spray.
In a large bowl, mix the dry ingredients together
Add the wet ingredients and zucchini
Stir well to combine. Carefully pour oatmeal mixture into the prepared baking dish. (If you want you can scatter some walnuts on top)
Bake for 40 minutes and let it cool down for a few minutes afterwards.