Preheat oven to 375.
Combine flour, oats, brown sugar, cinnamon and 1/2 teaspoon salt in a small bowl. Add butter and 1 teaspoon vanilla; stir with a fork until moist and crumbly.
Combine 1 teaspoon vanilla, cider, sugar, cornstarch and a dash of salt in a large bowl; stir with a whisk until sugar dissolves and mixture is smooth. Add apples, tossing to coat. Spoon apple mixture into a 13x9-inch baking dish coated with cooking spray. Sprinkle with oat mixture. Cover with foil; bake at 375 for 30 minutes. Uncover and bake 30 minutes or until browned and bubbly.
Bake
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