2 (6 oz.) pkgs. semi-sweet chocolate chips
1 (6 oz.) pkg. milk chocolate chips
1 (14 oz.) can sweetened condensed milk (not evaporated milk)
1/2 to 1 c. chopped nuts
1 1/2 tsp. vanilla extract

In heavy saucepan over low heat, melt chips with sweetened condensed milk and salt. Remove from heat; stir in nuts and vanilla. Spread evenly into wax paper lined 8 or 9 inch square pan. Chill 2 hours or until firm. Turn fudge onto cutting board; peel off paper and cut into squares. Store, loosely covered, at room temperature.