1. Preheat oven to 400 degrees. Lightly grease a 2 quart glass baking dish (or clay baker is fine too).
2. Combine apples and orange juice in a large bowl.
3. Stir in sugar, cornstarch, vanilla, and 1/2 tsp cinnamon; toss to coat apples.
4. Spoon apple mixture into prepared dish.
5. Combine brown sugar, flour, remaining 1/2 tsp cinnamon and nutmeg in a medium bowl.
6. Cut in butter with a pastry blender until mixture is coarse and crumbly and then stir in oats.
7. Sprinkle topping mixture over apple mixture.
8. Bake for 25-30 minutes until apples are tender.