Prepare the crust by combining graham cracker crumbs, granulated sugar, and melted butter in a mixing bowl. Press into a 9-inch springform pan and chill for 30 minutes.
Beat softened cream cheese and powdered sugar until smooth, then mix in vanilla extract and marshmallow fluff. Fold in whipped cream until smooth.
Pour filling over the crust, spreading evenly and jiggling to settle.
Cover and chill in the refrigerator for at least 4 hours until firm.
Prepare topping by folding remaining marshmallow fluff and whipped cream together, then spread over the cheesecake and garnish.
Chill for an additional 1-2 hours before serving. Slice and enjoy!