For the Nutella oatmeal donuts, put all the ingredients in a bowl and mix for at least one minute until frothy. Preheat the oven to 170°C and pour the batter into donut molds.
Bake for 15-20 minutes. It is best to use a wooden stick to test whether the donuts are already cooked through. Decorate the Nutella oatmeal donuts with warm Nutella and serve with fresh berries.
Preparation Tip:
You can also prepare the Nutella oatmeal donuts in other small ramekins, but then the baking time may be slightly longer.