INGREDIENTS
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1 (18.25-ounce) package devil's food cake mix
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1 cup water
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1/3 cup chocolate-flavored syrup
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1/3 cup vegetable oil
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3 eggs
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3/4 cup semisweet chocolate chips, divided
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1/2 cup (1 stick) butter, softened
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1/2 cup plus ½ teaspoon vegetable shortening
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4 cups confectioners' sugar
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2 tablespoons milk
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1 teaspoon vanilla extract