PREHEAT oven to 400° F. Lightly grease 2-quart baking dish.
COMBINE apples and orange juice in large bowl. Stir in granulated sugar, cornstarch, vanilla extract and 1/2 teaspoon cinnamon; toss to coat. Spoon mixture into prepared dish.
COMBINE brown sugar, flour and remaining cinnamon in medium bowl. Cut in margarine with pastry blender or two knives until mixture resembles coarse crumbs; stir in oats. Sprinkle over apple mixture.
BAKE for 25 to 30 minutes or until topping is golden brown and apples are tender.