Cut a piece of parchment paper to fit in the bottom of an 8-inch springform pan.
Spray the paper with cooking spray.
Pour 1-1/2 cups of water in the Instant Pot and place a rack in the bottom.
Prepare a sling to fit under and up the sides of the springform pan for easy lift-out.
In a food processor, pulse the cookies until fine.
Add the melted butter, brown sugar, salt, nutmeg, allspice, ginger and pumpkin pie spice.
Pulse a few more times to mix.
Pour the crust into the springrom pan and press it into the bottom and up the sides. Place the crust in the freezer.
Clean the food processor.
Combine the cream cheese and granulated Swerve.
Process until smooth.
Add vanilla, pumpkin, sour cream, remaining spices and cornstarch.
Process until smooth.
Add eggs and pulse a few more times.
Pour the filling over the crust.
Cover with a damp paper towel and aluminum foil.
Set the pan over the sling and lower it into the Instant Pot.
Seal the lid on the Instant Pot.
Set the Instant Pot to Sealing.
Add 48 minutes using the Manual setting on high pressure.
After cooking, natural release for 20 minutes; then, manually release the remaining pressure.
Open the lid and remove the pan, using the sling.
Cool covered for 10 minutes. If the filling is too jiggly after removing the cover, re-cover it with the damp paper towel and aluminum foil and place it back in the Instant Pot for 10 minutes with a 15 minute natural release.
Let it cool for an hour; then, chill it for 4 hours.
Top with the whipped cream and sprinkle with the pumpkin pie spice or drizzle with honey or chocolate.