Combine the sweetened condensed milk, heavy cream, and matcha powder in a blender*.
Blend together on a low speed, slowly adding in the whiskey until fully incorporated, which should take about 20 to 30 seconds**.
Store it in a tightly sealed container in the refrigerator, and make sure to shake it well before serving.
Video
Notes
* You can sift in the matcha powder as an extra step to help prevent clumps.** Do not blend longer than 30 seconds or the cream can slightly thicken.It can last up to 1 month in a sealed container in the fridge. This will depend on the freshness of the cream you used, the cleanliness of the storage container, and how often you're exposing it to air by opening the container.