Melt 1/2 cup butter or margarine and 1 square unsweetened chocolate in saucepan. Blend granulated sugar, 1 teaspoon vanilla, egg, crumbs, coconut and nuts into butter-chocolate mixture. Mix well.
Press into ungreased baking dish, 11 1/2 x 7 1/2 inch or square 9 x 9 inch pan. Refrigerate.
Mix 1/4 cup butter, milk, confectioners' sugar and 1 teaspoon vanilla. Spread over crumb mixture. Chill.
Melt 1-1/2 squares sweetened chocolate and spread evenly over chilled filling. Chill again. Cut into small squares before completely firm.
