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Preheat the oven to 400 degrees.
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First, prepare the crumble topping. In a medium bowl whisk together flour, oats, brown sugar, sugar, salt, and cinnamon. Cut in the butter with a pastry knife, or two forks, or with your hands until mixture is crumbly. Set aside.
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Peel and chop 4 of the apples. Add chopped apples, vanilla, butter, brown sugar, and cinnamon. Microwave for 3 minutes.
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Chop the tops off of the remaining 4 apples and use a spoon to scoop out the flesh. Discard the flesh. You don't need to get every little bit out, just enough to make a "bowl" for the filling.
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Fill scooped-out apples with apple filling from the sauce pan. Top with a generous amount of crumble topping.
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Place stuffed apples on a baking sheet and bake for 10-15 minutes until crumble topping is crispy. Serve warm and top with ice cream and caramel sauce if desired. Enjoy!