place sugar, butter, milk, and marshmallows in large saucepan. cook on medium until mixture comes to boil. stirring constantly. Boil 5 min. Add peanut butter chips and vanilla. Cook until chips are melted and mixture is well blended. Spread into prepared pan. Sprinkle with peanuts and press lightly into fudge.
refrigerate several hours or overnight. Cut into squares. Enjoy