pans 10 minutes. Remove from pans to cool on a wire rack. Frost and sprinkle walnuts around the top edge of the cake. For the Frosting: Microwave the chocolate and margarine or butter in a large microwavesafe bowl on high for 1-2 minutes or until margarine is melted. Stir chocolate until completely melted. Stir in confectioners sugar, milk and vanilla and blend until smooth. Let stand, if necessary, until of spreading consistency, stirring occasionally. Spread quickly. (Add an additional 2-3 tsps. of milk if frosting becomes too thick) Makes about 2 1/2 cups frosting.