In a large mixing bowl, whisk together the milk, heavy cream, powdered sugar, cocoa powder, and vanilla extract.
Whisk until all ingredients are combined and it looks like chocolate milk.
Pour into the Ninja Creami pint and cover with the lid.
Place in the freezer on a flat surface for 24 hours.
Remove from the freezer and place it into the outer bowl of the Ninja Creami.
Attach the lid with the mixer to the bowl.
Place the bowl on the Ninja Creami until it locks in position.
Select the ice cream function.
Remove pint from outer bowl.
Serve or freeze.
If you prefer soft serve, add a tablespoon of milk or cream and run for a second time on ice cream function.
Notes
Half and Half can be subbed for Heavy Cream.If you prefer soft serve, add about a tablespoon or cream or milk and run for an additional time on the ice cream function, this means it will run twice on the ice cream function.