Line 9x13 glass pan with parchment & then spray with cooking spray. Set aside.
Put chocolate chips & vanilla in mixer bowl. Set aside.
Heat sugar, margarine, evaporated milk & marshmallow cream in 3 qt. heavy saucepan over medium heat. Stir until mixture boils, boil for 5 full minutes- stirring constantly.
Remove from heat. Pour into mixer bowl over the top of the chocolate chips.
Beat in mixer until it's smooth & looks like silk.
Transfer to your baking sheet. Refrigerate for at least 2 hours before cutting & serving.