Preheat the Oven: Start by preheating your oven to 350°F (175°C).
Prepare the Oats: In a large mixing bowl, combine the rolled oats, baking powder, cinnamon, and salt.
Mix the Wet Ingredients: In another bowl, whisk together the milk, brown sugar, grated carrots, and mixed fruits until well combined.
Combine Ingredients: Pour the wet ingredients into the bowl with the oats and stir until everything is well incorporated.
Transfer to Baking Dish: Grease a baking dish and pour the oatmeal mixture into the dish, spreading it evenly.
Add Nuts: If using, sprinkle the chopped nuts on top for an added crunch.
Bake: Place the dish in the oven and bake for 25-30 minutes, or until the top is golden and the oats are set.
Cool and Serve: Remove from the oven and let it cool slightly before serving. Enjoy warm!