1Heat milk until it just begins to bubble around the edges in a 3-quart saucepan over medium heat (do not boil). Remove from heat, and whisk in chocolate morsels until melted. Cool slightly.
2Stir together cold water and cornstarch until dissolved.
3Whisk cornstarch mixture, sweetened condensed milk, eggs, and vanilla into chocolate mixture. Bring to a boil over medium heat, whisking constantly. Boil 1 minute or until mixture thickens and is smooth. (Do not overcook.) ***Should be the consistency of thick pudding.
4Remove from heat, and whisk in 3 tablespoons of butter. Spoon mixture into pie crust. Cover and chill at least 8 hours.
5To toast pecans, heat oven to 350 deg., melt 2 tablespoons butter, place pecans on a parchment lined baking sheet, drizzle the melted butter over the pecans (stir them up a little to coat), place in oven for 5 minutes. Cool completely before using.
6For the whipped cream: It helps if you use a metal bowl and the equipment is cold -- put the beaters and bowl in the freezer before using.
Beat whipping cream at high speed with an electric mixer until foamy; gradually add sugar, beating until soft peaks form. Spread whipped cream evenly over pie filling, and sprinkle with toasted pecans and candy bar pieces.