COOKIE BASE:
Preheat oven to 350 degrees. In bowl, combine wafer crumbs and Natural Brown sugar. Stir in butter. Press into 9x13 inch pan. Bake at 350 degrees for 8 minutes.
TOFFEE LAYER:
In saucepan, combine butter and Bar sugar. Cook over moderate heat, stirring constantly, until mixture comes to a boil. Boil 1 minute. Pour immediately over baked base. Bake at 350 degrees for 10 minutes. 
Let stand 2 minutes. Spread chocolate chips on top. Let stand 2 to 3 minutes until morsels are shiny and soft. Spread evenly. Sprinkle with chopped nuts. Chill about 1/2 hour and cut into 2x1 inch pieces.