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Preheat oven to 350 degrees.
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Peel, core and slice apples.
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Make filling: In a large mixing bowl, combine granulated sugar, cornstarch, half of the cinnamon, salt, vanilla and water. Mix thouroughly.
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Fold in apples into filling mixture and coat evenly.
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Spray 8 x 8 baking dish with butter flavored cooking spray. Pur apple mixture into baking dish.
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Make crumble topping: In a large mixing bowl combine flour, brown sugar, oats and melted butter. Mix well with a pastry blender or spatula.
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Spread crumble mixture over apples and sprinkle with remaining cinnamon.
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Bake for 40 to 45 minutes. Serve warm.