PREHEAT oven to 350°F. Place half of the apple slices in 1-1/2-qt. baking dish; top with half of the caramels. Repeat layers. Pour milk over caramel layer; set aside.
MIX wafer crumbs, oats and sugar in medium bowl. Cut in margarine with pastry blender or 2 knives until mixture resembles coarse crumbs. Sprinkle evenly over carmel layer.
BAKE 30 to 35 min. or until apples are tender. Serve warm.