Heat oven to 400°F. Lightly grease 2-quart baking dish. In large bowl, combine apples and orange juice. Stir in granulated sugar, cornstarch, vanilla and 1/2 teaspoon cinnamon; toss to coat. Spoon mixture into baking dish. In medium bowl, combine brown sugar, flour and remaining cinnamon; mix well. Cut in margarine with pastry blender or two knives until mixture resembles coarse crumbs; stir in oats. Sprinkle over apple mixture. Bake 25 to 30 minutes or until topping is golden brown and apples are tender. Serve warm or at room temperature.