Combine sugar, margarine and milk in heavy 2½-3 quart saucepan. Bring to full boil, stirring constantly. Continue boiling 5 minutes over medium heat or until candy thermometer reaches 234 degrees, stirring constantly to prevent scorching. Remove from heat. Stir in chocolate pieces until melted. Add remaining ingredients. Mix until blended. Pour into 9x13 pan. Let cool and cut into squares.
Note: Do not substitute condensed milk for evaporated milk
Microwave margarine in 4 quart bowl on High for 1 minute or until melted. Add sugar and milk, mix well.
Microwave on High for 5 minutes until mixture begins to boil; stir after 3 minutes
Mix well, scrape bowl. Microwave 5 ½ minutes, stir after 3 minutes.
Stir in chocolate pieces until melted. Add remaining ingredients, mix well.
Pour into greased 9x13 pan. Cool at room temperature, cut into squares