1preheat oven to 375. grease or spray a 2 quart casserole dish with either butter or cooking spray. in a medium bowl, toss together the oats, baking powder, cinnamon and salt.
2in a separate bowl, whisk together the maple syrup, milk, egg, the melted butter and the vanilla.
3place the diced apples in a single layer in the bottom of the prepared casserole dish.
4sprinkle about two thirds of the raisins over the top of apples, then cover the fruit with the oat mixture. drizzle the milk mixture over the oats, making sure to distribute the milk as evenly as possible.
5sprinkle the remaining raisins over the top of the oats. bake the oatmeal for 35-45 minutes until the top is golden brown and the oats have set.
6remove the oatmeal from the oven and serve hot with more maple syrup.