Nilla Wafer Apple Crisp

8 cups (4 lrg) Granny Smith apples, peeled, thinly sliced

½ cup brown sugar, firmly packed, divided

2 tsp ground cinnamon, divided

1/3 quick-cooking oats

¼ cup cold margarine

1 cup (about 25) reduced fat Nilla wafers, crushed

1 ½ cups cool whip, thawed

Preheat oven to 350 degrees.  Toss apples with 1 /4 cup brown sugar and 1 tsp cinnamon.  Spoon into 9” square baking dish.  Combine oats, the remaining ¼ cup brown sugar and 1 tsp cinnamon in medium bowl.  Cut margarine in with pastry blender or two knives, until mixture looks like coarse crumbs.  Add wafer crumbs, mix well.  Spread crumb mixture evenly over apples.  Bake 30 to 35 minutes or until apples are tender.  Serve warm or cooled.  Top with whipped cream.