Vanilla Apple Crisp

4 large Granny Smith apples, peeled, thinly sliced
1/2 c. packed brown sugar, divided
2 tsp. ground cinnamon, divided
1/3 c. old-fashioned or quick-cooking oats
1/4 c. cold margarine
25 reduced fat vanilla wafers, crushed
1 1/2 c. thawed whipped topping

Toss apples with 1/4 cup sugar and 1 teaspoon cinnamon. Spoon into 8-inch or 9-inch square baking dish. Combine oats, remaining sugar and cinnamon in medium bowl. Cut in margarine with pastry blender or two knives until mixture resembles coarse crumbs. Stir in wafer crumbs; sprinkle over apples. Bake 30-35 minutes in 350° oven ur until apples are tender. Serve with whipped topping. Makes 12 (1/2 cup) servings.