1.
Preheat oven to 350 degrees F (175 degrees C).
2.
Toss apples and nuts with sugar and cinnamon.
3.
Alternate layers of yams and apples in a baking dish. Dot with butter and sprinkle with brown sugar.
4.
Bake in covered dish for 30 - 40 minutes.
5.
Cover with marshmallows and put back under broiler until golden brown. Watch very closely or they will burn.