Double-chocolate Fudge

Ingredients

 * 1 can (14 oz) sweetened condensed milk
 * 2 cups (12 oz) semisweet chocolate chips
 * 1 oz unsweetened chocolate
 * 1 tsp vanilla
 * 1½ cups chopped nuts

Directions

 * 1) Butter baking pan, 8 x 8 x 2 inches.
 * 2) Stir milk and chocolate chips in 2-quart casserole; add chocolate.
 * 3) Microwave uncovered on high (100%) 1 minute; stir.
 * 4) Microwave until chocolate is melted and mixture can be stirred smooth, about 2 minutes longer.
 * 5) Stir in vanilla and nuts.
 * 6) Spread mixture evenly in pan.
 * 7) Refrigerate until firm.
 * 8) Cut into 1-inch squares.