In a bowl, mix the graham cracker crumbs and melted butter until everything’s evenly coated and looks like wet sand.
Press the mixture firmly into the bottom of an 8-inch springform pan, then pop it in the fridge while you make the filling.
In a large chilled bowl, beat the heavy whipping cream until stiff peaks form. This is what makes the cheesecake so light and fluffy. Set aside.
In another bowl, beat the softened cream cheese with the sugar until it’s smooth, creamy, and totally lump-free.
Gently fold the whipped cream into the cream cheese mixture until everything’s combined and airy.
Spread the cheesecake filling evenly over the chilled crust, smoothing the top with a spatula.
In a microwave-safe bowl, warm the cranberry sauce in 30-second intervals, whisking until smooth and spreadable.
Drop spoonfuls of cranberry sauce over the cheesecake, then use a knife to gently swirl it through the filling for that gorgeous marbled look.
Chill the cheesecake in the fridge (or freezer) for at least 4 hours until set and sliceable.
Just before serving, top with whipped cream, fresh cranberries, and rosemary sprigs for the ultimate festive touch.