TWO - TONE FUDGE

1-1/2 teaspoons plus 1/2 cup butter ( no substitutes), softened, divided
2 cups packed brown sugar
1 cup sugar
1 cup evaporated milk
1 jar (7 oz. ) marshmallow creme
1 teaspoon vanilla extract
1-1/2 cups semisweet chocolate chips
1 cup chopped walnuts
1/2 cup butterscotch chips

Line a 9-in. square pan with foil and grease foil with 1-1/2 tsp. butter; set aside. 
In heavy saucepan, combine sugars, milk and remaining butter. Cook and stir 
over medium heat until sugar is dissolved. Bring to a rapid boil; boil for 5 min., 
stirring constantly. Reduce heat to low and stir in  marshmallow crème until melted and blended.

 Remove from heat; and stir in vanilla Pour 2 -1/2  cups into a bowl and add chocolate chips
 and walnuts to the bowl. Pour into prepared pan. Add the butterscotch chips to the 
remaining marshmallow mixture; stir until chips are melted.
 Pour over chocolate layer and gently spread to cover.  
Refrigerate overnight or until firm . Remove from foil and cut to desired size. 
Store covered in Refrigerator.