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Butter 13x9-inch pan; line with parchment or waxed paper. Butter paper.
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Sprinkle 3/4 cup milk chocolate chips, 3/4 cup semi-sweet chocolate chips, 2 tablespoons almonds, 2 tablespoons pecans and 2 tablespoons walnuts over parchment paper; set aside.
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Combine sugar, butter, water and salt in heavy 4-quart saucepan. Cook
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over medium heat, stirring constantly, until mixture comes to a full boil (10
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to 12 minutes). Continue boiling, stirring often, until candy thermometer
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reaches 305°F or small amount of mixture dropped into ice water forms a
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hard brittle strand (20 to 25 minutes).
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Remove from heat; stir in vanilla.
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Pour mixture into prepared pan.Immediately sprinkle with remaining almonds, pecans and walnuts; swirl into toffee with knife. Sprinkle remaining milk chocolate chips and semi-sweet chocolate chips evenly over toffee, pressing gently into toffee.
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Cool completely. Break into pieces.