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Line a 15xl0xl-inch baking pan with foil, extending foil over edges of pan; set aside.
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Butter the sides of a heavy 2-quart saucepan.
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Melt the 1 cup butter in saucepan.
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Add sugar, the water, and corn syrup.
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Cook and stir over medium high heat until mixture boils.
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Clip a candy thermometer to side of pan.
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Reduce heat to medium; continue boiling at a moderate, steady rate, stirring frequently, until thermometer registers 290°F, soft-crack stage (about 15 minutes).
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(Adjust heat as necessary to maintain a steady boil.) Watch carefully after 280 degrees F.
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to prevent scorching.
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Remove pan from heat; remove thermometer.
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Stir in vanilla.
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Pour candy into the prepared pan, spreading quickly to about 1/4-inch thickness.
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(Toffee will not cover surface of pan.) Let candy stand for 2 to 3 minutes or just until set.
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Sprinkle with white baking pieces.
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Let stand for 1 to 2 minutes.
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When baking pieces are soft, spread over candy.
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Sprinkle with nuts, pressing lightly into melted white chocolate.
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Chill in the refrigerator about 20 minutes or until firm.
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Use foil to lift candy out of pan.
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Break candy into pieces about 2 inches in size.
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Store candy in a tightly covered container in the refrigerator for up to 3 weeks.