Preheat oven to 160°C and grease your donut pan with flavourless oil OR turn on your donut maker (you won't need any oil if you use the latter).
In a mixing bowl, combine the Nutella, eggs and plain together until mixed thoroughly.
Transfer mixture to a medium zip lock bag and cut the corner tip cut off. Pipe the mixture into the donut pans until each is approximately ⅔ full.
If using a donut pan, bake in the oven for around 10 minutes until they spring back when pressed. If using a mini donut maker, bake for 2-3 minutes.
Allow donuts to cool completely before icing with extra Nutella