1. Preheat oven to 350°F.
2. Place apples in a mixing bowl and coat with lemon juice.
3. Lightly coat a large casserole dish with cooking spray.
4. Layer potatoes and apples in casserole and pour cider over the whole thing.
5. Cover with aluminum foil and bake in 350°F oven 40 minutes.
6. Uncover and continue to bake 15 minutes, or until potatoes are fork tender.