Combine sugar, margarine, milk and marshmallow creme in 2 quart microwave safe bowl. Microcook on high 3 minutes. Stir well. Continue microcooking 2 to 3 minutes more or until mixture boils. Reduce power to 50% and microcook 5 minutes. Add chocolate chips and shaved baking chocolate. Stir until melted. Pour into buttered 8" dish. From the recipe files of Sheila Exner September 1991