How to Make It
Stir together sweetened condensed milk and whipped topping in a large bowl. Gradually whisk in chocolate milk until well blended.
Pour half of mixture into an ice cream maker, and freeze according to manufacturer’s instructions. Refrigerate remaining mixture until first batch is complete or up to 1 week.
Serve first batch immediately with a straw and a spoon. Repeat freezing process when ready to prepare remaining frosty mixture.