Fill a medium pot halfway with water
Place a second pot over the first (it's ok if it touches the water)
Heat the water over medium heat for 10 minutes
Add the butterscotch morsels and peanut butter to the top pot
Stir frequently for 10 minutes or until the mixture is melted
Stir in chow mein noodles and marshmallows
Drop by spoonfuls onto a waxed paper lined cookie sheet
Chill in the refrigerator for 30 minutes or until set