Things I used are: pure cocoa powder, instant cappuccino powder, cinnamon, freshly boiled water, and hazelnut milk.
I was using a large travel mug to drink from: I estimate it's about 400-450 ml. I used 2 teaspoons of cocoa, 4 teaspoons of instant cappuccino - that sounds like a lot, but that's as much as you need to make 150 ml of cappuccino according to the instructions on the tub! -, and a pinch of cinnamon. Then I filled up the mug with water for about 90% and added a splash of the hazelnut milk.
Et voilà! looks like hot chocolate, but it's much 'lighter' since it's made with mostly water instead of milkEnjoy!
Sincerely,
R.