Just grab the jar, assuming its near-empty, and pour warm milk straight into it.

Screw the lid back on tight and shake.

When the Nutella is fully dissolved, pour your freshly-made Nutella cocoa into individual cups and serve.

If you want to go that route, maybe start with hot milk, and let it cool.

For a visual demonstration, check out the video above (skip to 00:33).

5 Minute Nutella Hacks| The Kitchy Kitchen (YouTube)