Chocolate Fudge

18 ozs. semi sweet chocolate chips
1-14oz. can sweetened condensed milk
dash of salt
1 1/2 tsp. vanilla extract
Melt chocolate chips, condensed milk and salt. Take from heat, add vanilla. Spread evenly into waxed paper lined 8 or 9 inch square pan. Chill 2hrs. or until firm. Overturn pan and remove fudge. Peel off waxed paper and cut into squares.