Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine rolled oats, grated carrots, Greek yogurt, eggs, maple syrup, vanilla extract, ground cinnamon, baking powder, and salt.
Stir in the chopped nuts until evenly distributed throughout the mixture.
Grease a baking dish with cooking spray or butter.
Pour the oat mixture into the prepared baking dish, spreading it out evenly.
Bake in the preheated oven for 40-45 minutes or until the top is golden brown and a toothpick inserted in the center comes out clean.
Allow the baked oatmeal to cool for about 10 minutes before slicing and serving.
Serve warm, and feel free to top with additional nuts, yogurt, or a drizzle of maple syrup, if desired.