1 (12 oz.) pkg. semi-sweet chocolate chips
1 cube bitter or butter
2 eggs, beaten until frothy
1 lb. powdered sugar
1/2 tsp. vanilla
1 c. chopped walnuts

In large double boiler melt chocolate and butter. Add eggs, sugar and vanilla; beat well. Stir in nuts. Pour into buttered 9 x 13 inch pan and put in refrigerator to cool.