For the chocolate. I mix 2spoon of Nutella with dissolved powdered milk(I leave it a little thick) in a pan and heat a little.

Dip your doughnut in the Nutella mixture and decorate with the below whip cream mixture or sprinkle some icing sugar.

For the whipping cream. Mix your whipping cream like 2tbs and icing sugar 1tbs with water(to your desired thickness) dip your doughnut and sprinkle some cocoa powder/sprinkles or you can decorate with Nutella mixture above