Pour the milk, heavy cream, sugar, cream cheese, and vanilla into a small blender and blend until all ingredients are fully combined. Pour the mixture into a Ninja Creami pint container.
Freeze on a level surface for 24 hours. Your freezer should be between 9 and -7 degrees Fahrenheit. To avoid getting a bump on the top of the frozen mixture, freeze with the lid off of the container.
Process the Ice Cream
After 24 hours, remove the pint container from the freezer.
Place the pint container into the outer bowl of the Ninja Creami and then process on "ICE CREAM."
If the ice cream is dry or crumbly looking, pour in a tablespoon or two of milk and then re-spin. You may have to repeat this process a couple of times.
Dig a well down the center of the ice cream and pour in the brownies, cookies, chips, and caramel syrup. Process on mix-ins.