No Cook Fudge

4 (1 ounce) squares unsweetened chocolate
1/2 cup butter or margarine
1 box confectioners' sugar
1 egg
1/3 cup sweetened condensed milk
1 teaspoon vanilla extract
1 cup chopped nuts

Melt chocolate and butter. Sift sugar and mix with egg and milk. Stir in chocolate and butter mixture. Add vanilla extract and nuts. Pour into buttered 8-inch square pan. Chill in refrigerator at least 2 hours.