Butterscotch Pecan Fudge

Recipe from Betty Crocker. 1 1/2 cups packed brown sugar 1/2 cup butter 1 (5 oz) can evaporated milk 1 (7 oz) jar marshmallow creme ( you could most likely substitute actual marshmallows in this) 1 bag (110z) or about 2 cups butterscotch chips 1 cup chop