In the chilled bowl of an electric mixer, add the cream. With the tip of a paring knife, scrape in the seeds from the vanilla bean. With the whisk attachment, mix on medium speed until the cream begins to hold very soft peaks, 1 to 2 minutes.
Add the confectioners' sugar and whisk on high speed to soft peaks, just 1 minute longer. Use immediately or chill for a few hours, rewhipping with a whisk before serving.