Add 1 ½ cups heavy cream and 1 ½ cups candy corn to a medium saucepan over medium heat. Let mixture heat (without boiling) and stir until candy corn is dissolved.
Move mixture to a large bowl and let cool to room temperature. Stir in remaining heavy cream and whole milk. Cover bowl and place in fridge to chill for at least 6 hours.
Once chilled, pour mixture into ice cream machine and process according to manufacturer's instructions. While ice cream is processing, chop another cup of candy corn. Once ice cream is almost done processing, add in chopped candy corn.
Place ice cream in airtight container and place in freezer for at least 6 hours, but ideally overnight.
Serve ice cream in bowls with remaining ½ cup candy corn sprinkled over the top.