Preheat the oven to 350℉. Coat a 9" square pan with coconut oil spray.

In a large saucepan, stir together the milk, brown sugar, butter, and cinnamon and slowly bring to a boil.

While the milk is heating, use a large mixing bowl and stir together the oats, chopped apples, cranberries, and nuts. Spread the dry ingredients into the bottom of the prepared pan.

Once the milk boils, pour it evenly over the oatmeal mixture in the pan. Bake uncovered for 30-35 minutes, until all the liquid has been absorbed and the oatmeal is tender.

Cut the oatmeal casserole into 6 pieces and serve in a bowl. Garnish with extra milk and sliced apples.