Grease a 9-inch springform pan lightly and set it aside.
Place a shallow pan in the oven on the lowest rack, leaving the center rack open. Pour warm water 3/4 of the way up the sides of the shallow pan.
Preheat your oven to 350°F.
Make the crust
In a large bowl, place the cookie crumbs and melted butter and mix until the crumbs are moistened.
Press the crumbs into the bottom and halfway up the sides of the prepared pan. Wrap the bottom and about half of the sides of the pan in a large piece of heavy duty aluminum foil. Set the pan aside.
Make the filling
In a large bowl with a hand mixer or the bowl of a stand mixer fitted with the paddle attachment, place the cream cheese and flour. Beat on medium, then medium-high speed, until light and fluffy (about 3 minutes).
Add the sugar, molasses, vanilla, pumpkin puree, and pumpkin spice, and beat on medium speed until just combined. Increase the speed to medium-high and continue to beat until well-combined (another 2 minutes).
Add the eggs, and beat on medium speed just until combined. Do not whip.
Pour the filling out of the bowl and on top of the crust in the prepared pan. Spread into an even layer, and bang the pan a few times firmly straight down on the counter to break any large air bubbles.
Bake the cheesecake
Place the cheesecake in the center of the preheated oven, with the pan of water just below it on the lower rack.
Close the oven door, and bake for 1 hour, or until most of the cake is set, but the center is still somewhat loose when shaken from side to side.
Turn off the oven, crack the oven door a bit, leaving the cake inside. Allow to sit for about 30 minutes.
Remove the cake from the oven and place on a wire rack to cool to room temperature.
Place the pan in the refrigerator to chill until set (about 4 hours).
Unmold the chilled cake and loosen the bottom from the pan. Transfer carefully to a serving platter.
Slice with a hot, wet knife for clean slices, wiping the knife after each slice.
Top with whipped cream and cookie crumbles, as desired, before serving.
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Notes
Flour blend You can use any all purpose gluten free flour blend with a superfinely ground rice flour, with or without xanthan gum, including Nicole's Best, Better Batter's classic blend, Vitacost multi-blend gluten free flour, or Bob's Red Mill 1-to-1. You can also try just using 2 tablespoons of tapioca starch/flour or superfinely ground rice flour alone. Pumpkin pie spice To make your own, combine 2 teaspoons ground cinnamon + 1 teaspoon ground ginger + ½ teaspoon ground allspice + ½ teaspoon ground cloves + ¼ teaspoon freshly ground nutmeg. In its place, if you don't have the spice blend or all the ingredients, try using apple pie spice blend, which is similar, or just 2 teaspoons ground cinnamon if that's all you have. Nutrition information note Approximate nutrition information does not include any toppings.