For the yogurt panna cotta, mix whipping cream, vanilla bean and sugar and bring to a boil. Remove the pod.
Soak gelatin according to package directions, squeeze out and dissolve in whipped cream-sugar mixture while stirring constantly.
Let cool slightly and stir in yogurt, buttermilk and amaretto. Pour into a suitable mold and let set overnight in the refrigerator.
Remove the yogurt panna cotta from the refrigerator, wait a few minutes, then turn out and serve.