HEAT oven to 350°F.
TOSS apples with half each of the sugar and cinnamon; spoon into 8- or 9-inch square baking dish.
COMBINE oats, remaining sugar and cinnamon in medium bowl. Cut in margarine with pastry blender or 2 knives, until mixture resembles coarse crumbs. Stir in biscuit crumbs; spread over apples.
BAKE 30 to 35 min. or until apples are tender. Serve topped with Cool Whip.
serving size = 1/2 cup (125 mL)