1. Preheat oven to 375° (convection not
recommended). Peel sweet potatoes and cut in
half lengthwise. Place ina 9- by 13-inch baking
pan and brush with melted butter. Bake until
potatoes are soft when pressed, 45 to 55minutes.2. Meanwhile, prepare crust. Bake in same oven
with potatoes until lightly browned all over, 10
to 12 minutes.
3. Scrape any charred spots off potatoes, then
cut potatoes into chunks. Whirl in a food processor
or mash in a bowl with lemon juice until smooth.
Reserve 1 cup; save any extra for another use.
4. Reduce oven temperature to 325°. In a bowl,
with a mixer on high speed, beat cream cheese
until fluffy. Gradually beat in granulated and
brown sugars, scraping down sides of bowl
occasionally, until mixture is well blended and
smooth. Beat in eggs, one at a time, until blended.
Add reserved sweet potato mixture, the whipping
cream, sour cream, maple syrup, cinnamon, nutmeg,
and ginger. Mix on low speed until well blended.
5. Wrap bottom of cheesecake pan with heavy-duty
foil, pressing it up the sides. Pour batter over crust.
Put cheesecake pan in a 12- by 15-inch roasting pan
at least 2 inches deep. Set pans in oven and pour
enough boiling water into roasting pan to come
halfway up sides of cheesecake pan.
6. Bake until cake barely jiggles in the center when
gently shaken, about 55 minutes. Remove pans from
oven. Lift cheesecake pan from roasting pan and let
cool completely on a rack, about 1 hour, then chill
until cold, at least 1 1/2 hours, or up to 3 days (cover
once cold).
7. Up to 6 hours before serving, cut around inside
of pan rim to release cake; remove rim. With a pastry
bag, pipe dollops of maple cream onto cake. Or serve
maple cream separately, to spoon onto each wedge.
Pecan crust: Whirl 1/4 cup coarsely chopped pecans
in a blender until finely ground; you should have 1/4
cup. In a bowl, mix pecans, 1 1/4 cups fine graham
cracker crumbs, 2 tablespoons sugar, and 5 table-
spoons melted butter. Pour into a 9-inch cheesecake
pan with removable rim (2 1/4 inches tall). Press
mixture evenly over bottom of pan.
Maple cream: In a bowl, with a mixer on high speed,
beat 3/4 cup whipping cream until stiff peaks form.
On low speed, beat in 1/4 cup maple syrup just until
blended.