In a medium bowl, whisk together the brown sugar, cinnamon, ginger, nutmeg and salt. Whisk in the sweetpotatoes, half and half, butter, vanilla and eggs until smooth. Pour slowly over the chilled cheesecake filling.
6 Place the cheesecake on a baking sheet and bake at 350°F for 15 minutes. Reduce oven temperature to 325°F and bake for 55-60 minutes, until set along the outside and the center still has a slight jiggle (cover the edges with foil if it browns too quickly). Let cool to room temperature before refrigerating until ready to serve.