Line a 9x5 loaf pan with parchment paper or wax paper. Chill in the freezer.

In a large, chilled bowl, whisk together the sweetened condensed milk, vanilla extract and salt.

In another large, chilled bowl, whip the heavy cream until stiff peaks form. Fold half of the cooled whipped cream into the milk mixture.

Pour the lightened mixture into the remaining whipped cream and fold to combine.

Add any desired add-ins, like chocolate chips, caramel, peanut butter or freeze-dried fruit.

Pour into the prepared pan and freeze for 4 hours or more.