Line a 9 inch pan with parchment paper or aluminum foil.
Mix sugar, butter, and evaporated milk in a large sauce pan over medium heat stirring to dissolve sugar. Bring the mixture to a full boil stirring constantly for 4 minutes or until candy thermometer reaches 234 degrees.
Remove from the heat and stir in chocolate chips until melted. Add marshmallow creme, walnuts and vanilla. Spread into prepared pan and let cool.