Add milk, cocoa powder, sugar, and Nutella spread into a medium saucepan. Bring to medium heat and stir constantly with a whisk until everything is thoroughly mixed and smooth.
Serve warm. Top with marshmallows, whipped cream, or whatever else you desire.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.