Foolproof Chocolate Fudge
["3 (6 oz.) pkg. semi-sweet chocolate morsels (3 c.)", "1 (14 oz.) can sweetened condensed milk (not evaporated milk)", "dash of salt", "1 1/2 tsp. vanilla extract", "1/2 c. chopped nuts (optional)"]
["In a heavy saucepan, over low heat, melt morsels with sweetened condensed milk.", "Remove from heat.", "Stir in remaining ingredients. Spread evenly into wax paper-lined 8-inch square pan.", "Chill 2 to 3 hours or until firm.", "Turn fudge onto cutting board.", "Peel off paper and cut into squares.", "Store loosely covered at room temperature."]
["semi-sweet chocolate morsels", "condensed milk", "salt", "vanilla extract", "nuts"]