7-layer magic oatmeal bars

0 Preheat the oven to 375°F. Coat an 8x8-inch baking dish with cooking spray.
1 Stir together the oats, baking powder, cinnamon, and salt in a medium bowl. Whisk together the milk, eggs, maple syrup, orange zest, and vanilla in a large bowl.
2 Layer the ingredients in the prepared baking dish in the following order: apple, raisins, oat mixture, coconut, carrots, nuts, milk mixture. 
3 Bake until puffed and set, 35 to 40 minutes. Let sit 10 minutes before slicing into 9 squares. Serve warm with steamed milk (or reheat in the microwave with a splash of milk) or cold with chilled milk. The bars will keep in the fridge, covered, for up to 5 days.