Preheat oven to 350 degrees. Mix cinnamon, clove and nutmeg into small bowl. Brush a 9x13'' oven safe dish with olive oil. Place a thin layer of apple on bottom of the dish and then a thin layer of sweet potato. Sprinkle 1/3 of the spice mixture and ginger over the top. Continue layering - apple, sweet potato then spice mix until all ingredients have been incorporated. Sprinkle top of casserole with water or apple juice. Place dish in oven for 30 min. or until potato and apple are tender and juices are bubbling. Let dish cool before serving.