"King Arthur Flour Cookie Companion..."
INGREDIENTS
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1/2 cup unsalted butter
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1/2 cup vegetable shortening
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1 cup brown sugar
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1/2 cup sugar
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2 teaspoons vanilla extract
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3/4 teaspoon salt
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1 tablespoon cider vinegar or 1 tablespoon white vinegar
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1 large egg
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1 teaspoon baking soda
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2 cups unbleached all-purpose flour
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3 cups semi-sweet chocolate chips