Preheat the oven to 350°F (175°C) and lightly grease a 10-ounce oven-safe ramekin or small baking dish.
Place the rolled oats into a blender and pulse until they reach a fine flour-like consistency.
Add the protein powder, baking powder, cinnamon, ginger, and nutmeg to the blender and pulse briefly to combine dry ingredients.
Add the almond milk, maple syrup, and vanilla extract to the blender; process until the mixture is smooth and homogenous.
Transfer the batter to a mixing bowl and fold in the grated carrots, walnuts, and raisins using a spatula.
Pour the mixture into the prepared ramekin.
Bake for 22 to 25 minutes, or until the top is firm to the touch and a toothpick inserted into the center comes out clean.
Allow the baked oats to cool for 5 minutes before serving to let the structure set.