For the Nutella balls, put all the ingredients in a bowl and mix well. The easiest way to do this is with a mixer, with dough hook.
The result should be a firmer dough, similar to the consistency of shortbread. Preheat the oven to 180 °C. Divide the dough into 10 to 15 pieces and form into balls.
Flatten these balls and put a small blob of Nutella in the center and close the balls again. Bake for 10 to 15 minutes.