1 (14 oz.) can sweetened condensed milk
2 c. (12 oz.) semi-sweet chocolate chips
1 oz. unsweetened chocolate
1 tsp. vanilla
1 1/2 c. chopped nuts

Butter baking pan, 8x8x2 inches. Stir milk and chocolate chips in 2-quart casserole; add chocolate. Microwave uncovered on high 1 minute; stir. Microwave until chocolate is melted and mixture can be stirred smooth, about 2 minutes longer. Stir in vanilla and nuts. Spread mixture evenly in pan. Refrigerate until firm. Cut into 1-inch squares.