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Heat the oven to 375°F.
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Coat an 8-by-8-inch baking dish with butter.
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Mix the apples, sugar, cinnamon, and 1/8 teaspoon of the salt in a large bowl and toss to coat.
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Put the apple mixture in the baking dish and set aside.
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Mix together the brown sugar, oats, flour, and remaining 1/8 teaspoon salt.
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With a fork, blend in the butter pieces until small clumps form and the butter is well incorporated.
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Sprinkle the topping evenly over the apples.
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Bake until crispy and the apples are tender, about 40 to 45 minutes.
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Top with Vanilla Ice Cream or Fresh Whipped Cream.