Heat the milk in a saucepan, stirring constantly so that it does not burn. Pour the heated milk into a separate pot and froth it up with the milk frother.
In the meantime, prepare the espresso in an espresso pot.
Fill all 4 macchiato glasses with 2 teaspoons of Nutella each. Pour the finished milk foam in equal parts into the glasses. Finally, slowly pour 50 ml of hot espresso into the middle of each glass, which already contains the milk foam and the Nutella. Sprinkle with cocoa and serve.