01 - Preheat the oven to 350°F. Grease an 8×8-inch baking dish with butter or coconut oil.
02 - In a large mixing bowl, combine the rolled oats, ground cinnamon, ground nutmeg, baking powder, and salt. Stir until evenly distributed.
03 - Add the finely grated carrots, raisins, and chopped walnuts to the dry mixture. Toss gently to coat everything evenly.
04 - In a separate bowl, whisk together the milk, eggs, maple syrup, melted coconut oil, and vanilla extract until smooth and fully incorporated.
05 - Pour the wet mixture into the dry ingredients and stir gently until just combined. Avoid overmixing.
06 - Spread the oatmeal mixture evenly into the prepared baking dish, pressing it into an even layer.
07 - Bake for 35 to 40 minutes, until the center is set and the top is lightly golden brown.
08 - Allow the baked oatmeal to cool for 10 minutes before slicing into squares. Serve warm on its own or topped with a dollop of yogurt.