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Line 2 baking sheets with aluminum foil.
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Coat with nonstick cooking spray.
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(I have found that using Release aluminum foil works better).
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In a large saucepan over medium heat, combine sugars and corn syrup.
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Heat to 250 degrees F (120 degrees C).
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Remove from heat, and stir in butter until melted.
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Gradually stir in cream.
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Return to heat.
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Cook, stirring constantly, until temperature reaches 242 degrees F (116 degrees C).
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Remove from heat, and stir in vanilla and pecans.
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Drop by spoonful onto prepared pans.
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Cool completely, then wrap each piece individually with plastic.