Combine chocolate bars, chocolate chips, butter, and marshmallow whip in a large mixing bowl. Set aside.

In a large saucepan, combine sugar and evaporated milk. Bring to a rolling boil over medium heat. Stir constantly for 4 minutes.

Pour cooked ingredients over chocolate in mixing bowl in 4 to 6 intervals, stirring constantly until smooth.

Pour into a greased 9x13 glass baking dish. Cover tightly and refrigerate until hardened (several hours, best if overnight). Keep refrigerated until you serve.