Heat Milk (4 cup) in a medium-sized saucepan on medium - high heat until beginning to warm and steam.
Add the Nutella® (2 tablespoon), Unsweetened Cocoa Powder (2 tablespoon), and Raw Sugar (2 tablespoon) and whisk until dissolved and combined.
Bring to a gentle simmer while stirring, and take off heat.
Coat the inside of the cup with a swirl of Nutella® (to taste) and divide up the hot chocolate between them.
Top with desired combination of Marshmallow (to taste), Hazelnuts (to taste), and Chocolate Chips (to taste).