In a large mixing bowl, combine the softened cream cheese, pumpkin puree, and pure vanilla extract. Using an electric hand mixer on medium speed, blend until smooth and thoroughly combined.
Scrape down the sides of the bowl. Add the monk fruit sweetener, cinnamon, nutmeg, and salt. Mix on medium speed until evenly incorporated.
In a separate clean bowl, whip the cold heavy cream using an electric hand mixer on high speed for approximately 5 minutes, or until stiff peaks form.
Immediately fold the whipped cream into the pumpkin cheesecake mixture using a large wooden spoon or spatula until evenly combined.
Spoon the cheesecake filling into the prepared 10-inch graham cracker pie crust. Spread evenly and smooth the top.
Cover carefully and place in the freezer for approximately 3 hours, or until firm enough to slice.
Remove the cheesecake from the freezer and sprinkle the crushed pecans evenly over the top.
Allow to soften slightly if necessary, then slice and serve with whipped cream, if desired. Enjoy!