Turn the mixer down to low, and add in the applesauce (or egg yolk), stevia, and vanilla. Beat well, mixture will appear almost curdled from the applesauce, that is OK.
If you are using nuts, now is the time to roll the balls into the finely chopped walnuts. With no egg, you roll firmly to gently press the nuts slightly into the ball, OR roll in the whipped egg white first, then roll in the nuts.
Recipe via tessadomesticdiva.com