INGREDIENTS
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2 3/4 cups quick-cooking oats (not instant)
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1 1/4 cups all-purpose flour
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1 1/2 teaspoons apple pie spice
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1/2 teaspoon salt
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1/4 teaspoon baking soda
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3/4 cup butter, softened
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1 1/4 cups firmly packed brown sugar
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1 large egg
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1/4 cup plus 2 tablespoons whole milk, divided
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2 teaspoons vanilla extract
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1 cup finely chopped peeled Golden Delicious apple
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1 1/2 cups confectioners’ sugar