Prepare an 8-inch square baking pan with foil.
Chop 10 fun size Butterfinger candy bars, set aside.
In a heavy duty saucepan combine sugar, evaporated milk, butter and salt; bring to a full rolling boil over medium heat, stirring constantly. Boil and stir for another 5 minutes; remove from heat.
Immediately stir in marshmallows, morsels and vanilla. Stir until marshmallows & chocolate chips are melted. Pour into prepared pan and press chopped Butterfinger candy on top.
Refrigerate for 2 hours or until firm.
Lift foil from the sides of the pan to remove fudge and cut into 1 inch squares.