In a large bowl, whisk together heavy cream, sweetened condensed milk, whole milk, and mint extract.
Fill the ice cream maker with the mixture and run for 15-20 minutes.
Serve or freeze for later. Ice cream will be very soft right out of the machine.
Tip: When making ice cream be sure to keep your cold ingredients in the fridge and your frozen ice cream insert in the freezer until you are ready to use.