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Preheat oven to 375°F.
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In a food processor, crush graham crackers and pecans until fine crumbs form. Stir in melted butter, brown sugar, and salt.
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Press the mixture firmly into the bottom of a 9-inch springform pan. Bake for 10 minutes. Remove from oven and let cool. Reduce oven temperature to 350°F.
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In a large bowl, beat cream cheese with brown sugar and granulated sugar until smooth.
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Add eggs one at a time, mixing after each addition.
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Mix in pumpkin puree, sour cream (or yogurt), vanilla, and lemon juice until combined.
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Add flour, cinnamon, ginger, and nutmeg. Mix just until blended.
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Pour filling over cooled crust and smooth the top.
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Bake at 350°F for 1 hour 15 minutes, or until the center is just set. Turn off oven, crack the door, and let cheesecake cool inside for 1 hour. Then refrigerate until fully chilled.
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To make the topping, whip the heavy cream with powdered sugar, cinnamon, and vanilla until soft peaks form.
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Spread or pipe whipped topping over the chilled cheesecake. Sprinkle lightly with cinnamon before serving.