Preheat: Preheat the air fryer to 320°F (160°C) for approximately 3 minutes if required by your appliance.
Prepare the crust: Fit the unbaked 6-inch pie crust into an air-fryer-safe pie pan, trimming any excess pastry.
Mix the dry ingredients: Whisk together the sugar, flour, cornstarch, cinnamon, and salt in a medium bowl.
Add the cream: Slowly whisk in the heavy cream until the mixture is smooth.
Add butter and vanilla: Stir in the melted butter and vanilla extract until evenly combined.
Fill the crust: Pour the mixture into the prepared pie shell, leaving a little space below the top edge.
Air fry: Cook at 320°F (160°C) for approximately 20–30 minutes. Begin checking at 20 minutes, as air fryer performance varies.
Check doneness: Confirm that the center reaches approximately 170–175°F (77–79°C). The edges should be set, and the center should have only a slight wobble. If necessary, continue cooking in 3–5-minute increments.
Cool: Remove the pie carefully and cool on a rack for 45–60 minutes.
Chill: Refrigerate for at least 2–3 hours, until the filling is firm enough to slice.
Serve: Dust lightly with cinnamon, slice with a sharp knife, and serve chilled.