From the site:
"This coffee is seriously so easy to make. You start by making a strong pot of coffee. Then place the milk and Nutella in a saucepan and bring it to a low boil. Pour the boiling milk into a blender. I know I have heard of blenders exploding because of the heat inside. I leave the pour spout open until the very last second, so the heat doesn’t build up in the glass. Then blend the milk for 1-2 minutes to get a good foam. Pour that in your mug and pour the hot coffee carefully on the side. Top with some Cool Whip and sprinkles because that always makes your hot drinks more fun."