Make up the sourdough donut mix according to manufacturer instructions. Fry and let cool completely. Fill with cream cheese donut filling, roll in donut sugar.
Nutella Truffle Donut: https://www.dawnfoods.com/recipes/Nutella%20Truffle%20Donut-345
Bismark, Bismarck, Berliner, Cream, Filled, Doughnut, Fermented