INGREDIENTS
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1 cup all-purpose flour, spooned into measuring cup and leveled off with knife
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1 teaspoon baking powder
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1/4 teaspoon salt
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1/2 cup (1 stick) unsalted butter, room temperature
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2/3 cup granulated sugar, plus more for sprinkling over cake
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2 large eggs
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1 teaspoon pure vanilla extract
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3 tablespoons dark rum
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2 sweet baking apples, peeled, cored and cut into 1/2-inch cubes (such as honeycrisp, fuji or golden delicious)
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Confectioners’ sugar (optional)