Rinse and drain the black beans. Place them into a blender together with the brown sugar, almond milk, and cacao and blend until the mixture is smooth.
Then transfer it to a medium bowl and stir in the whole-wheat flour, the baking powder, and vanilla. Spray the donut pan with cooking spray
Either use a spoon to fill each donut or fill the batter into a Ziploc bag and cut off one edge.
Preheat the oven to 350 °F and bake the chocolate hazelnut donuts for 9-11 minutes. Allow to cool down in the pan for a couple of minutes, then move them to a cooling rack.
In the meantime, make the chocolate glaze. Melt hazelnut spread and pour on top of donuts. Then cool
