In the bowl of a stand mixer fitted with the whisk attachment, beat the whipping cream until soft peaks form.
Stop the beaters and melt a heaping tablespoon of marshmallow fluff in the microwave in 5-second intervals until just melted.
Stir gently until cooled to close to room temperature and you have a gooey, thick mixture.
Add the melted marshmallow creme to the whipped cream, and continue whipping on high until stiff peaks form.
Notes
If you desire a sweeter whipped cream, start by adding 1/4 cup of powdered sugar while mixing after adding the marshmallow cream. Continue to add powdered sugar, 1 tablespoon at a time, until you reach the desired sweetness.