"This is an easy to make hard to mess up fudge recipe. It does not require special equipment such as a candy thermometer or special techniques such as knowing candy stages. It is fast to prepare the hard part is waiting for it to set up."
Line a 13 by 9 inch baking sheet with foil. Spray or butter the foil.
Bring sugar, evaporated milk, and butter to a boil. Boil for 5 minutes, stirring every 30 seconds. Remove from heat. Stir in butterscotch chips and marshmallows until melted. Pour into prepared pan. Chill in the refridgerator for 8 hours to set up.