Chocolate Cream Filling
With an electric mixer, combine all ingredients on low, then beat on medium speed for 4-5 minutes until thick and fluffy. To fill the doughnuts, poke the narrow end of a chopstick into one end of the doughnut, about 2/3 of the way through. Swirl it around a little to create a space inside for the cream. Pipe cream into the doughnut.
If glazing doughnuts also, first fill with the cream, then dip in glaze.
Yields enough to fill about 2 dozen doughnuts, depending on how much you use in each (I only made a dozen doughnuts and had leftover filling).
Recipe from Curly Girl Kitchen