Place the whipping cream and powdered sugar in the bowl of a stand mixer fitted with a whisk attachment (or use a medium bowl and a handheld electric mixer) and begin to whip on medium-low speed.

After a minute or two, as the mixture begins to thicken, start to increase the speed until you are whisking on medium-high.

When the cream holds soft peaks (1 or 2 minutes more), turn the mixer to low and stir in the Crème fraiche until just combined.

Refrigerate for up to 8 hours or until ready to use.