Fill a large bowl with ice water and set it aside.
In a small saucepan, whisk together the egg yolks,
chocolate-hazelnut spread, cocoa powder, corn syrup, and sugar until the
mixture is fully combined and the sugar is dissolved. Do not do this over heat.
Whisk in the milk, heavy cream, and vanilla.
Place the pan over medium heat. Cook, stirring constantly
with a rubber spatula, until the temperature reaches 165°F to 175°F on an
instant-read thermometer.
Remove the pan from the heat and pour the base through a
fine-mesh strainer into a clean CREAMi Pint. Carefully place the container in
the prepared ice water bath, making sure the water doesn't spill into the base.
Once the base has cooled, place the storage lid on the pint
and freeze for 24 hours.
Remove the pint from the freezer and take off the lid. Place
the pint in the outer bowl of your Ninja CREAMi, install the Creamerizer Paddle
in the outer bowl lid, and lock the lid assembly onto the outer bowl. Place the
bowl assembly on the motor base, and twist the handle to the right to raise the
platform and lock it in place. Select the Gelato function.
Once the machine has finished processing, remove the gelato
from the pint. Serve immediately with desired toppings.
