3 c. semi-sweet chocolate chips
1 can (14 oz.) sweetened condensed milk
1/4 c. butter
1 c. walnuts

Mix all ingredients in large bowl. Microwave at high until chocolate chips are melted. 3-5 minutes (stir once in this process). Stir in nuts. Pour into well greased baking dish 8 x 8 inch. Refrigerate until solid; slice.