Combine margarine, sugar, evaporated milk, fluff and salt. Blend over medium heat, stirring constantly until mixture comes to a boil. (Don't mistake air bubbles for boiling!) After it comes to a boil, cook for a further 5 minutes (by timer), still stirring constantly. Remove from heat, add chocolate chips and vanilla and stir until blended. Add nuts if desired. Pour into a well-greased 9" square pan. Let cool. Enjoy!
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