Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      package       (12 oz.) semi sweet chocolate chips
   1      can           (14 oz.) sweetened condensed milk
   1 1/4  cups          chopped walnuts -- (optional)
   1      teaspoon      vanilla

Preparation:

In large glass measuring cup, combine chocolate chips and sweetened condensed milk. Microwave on high for 3 minutes. Stir until chips melt and mixture is smooth. Stir in vanilla and nuts (if desired). Spread evenly into foil lined 8 inch square pan. Chill until firm (about 2 hours).