01 - Preheat oven to 350°F. Grease an 8×8-inch baking dish with butter or non-stick spray.
02 - In a large mixing bowl, whisk together the rolled oats, cinnamon, nutmeg, baking powder, and salt until evenly distributed.
03 - In a separate bowl, whisk the eggs, milk, maple syrup (or honey), and vanilla extract until smooth and well blended.
04 - Pour the wet mixture into the dry ingredients and stir with a spatula until just combined. Avoid overmixing.
05 - Gently fold in the grated carrots, chopped nuts, raisins, and shredded coconut (if using) until evenly distributed throughout the batter.
06 - Pour the mixture into the prepared baking dish and spread it into an even layer using a spatula.
07 - Bake on the center rack for 35 to 40 minutes, until the top is lightly golden and the center is set. A toothpick inserted in the middle should come out clean.
08 - Remove from the oven and let cool for 10 minutes before slicing into squares. Serve warm with a dollop of yogurt or an extra drizzle of maple syrup.