INGREDIENTS
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1 stick (8 tablespoons) unsalted butter, melted, still warm
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1/3 cup granulated sugar
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1/3 cup light brown sugar
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1 teaspoon apple pie spice
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1/4 teaspoon kosher salt
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1 3/4 cups cake flour
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2 tablespoons unsalted butter
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3 cups diced peeled Granny Smith apples
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1 tablespoon light brown sugar
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1 teaspoon apple pie spice
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Pinch of kosher salt
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Nonstick cooking spray, for spraying the baking dish
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One 15.25-ounce box yellow cake mix (plus required ingredients)
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Confectioners' sugar, for dusting