Prepare the Oven: Preheat your oven to 350°F / 175°C.
Mix the Filling: In a medium mixing bowl, lightly whisk the eggs.
Add the pumpkin puree, pumpkin pie spice, cinnamon, and salt, stirring with a spatula until smooth and well-combined. Slowly stream in the heavy whipping cream while continuously stirring until the mixture is uniform and silky.
Assemble and Bake: Pour the pumpkin filling into your par-baked almond flour crust. To prevent over-browning, carefully cover the edge of the crust with a pie shield or a thin strip of aluminum foil.
Bake for 45 to 50 minutes, or until the center is just barely set (it should have a slight jiggle).
Remove the foil for the last 20 minutes of baking.
Cool and Chill: Let the pie cool completely on a wire rack at room temperature.
Once cooled, transfer it to the refrigerator to chill for at least 4 hours, or preferably overnight. This step is essential for the filling to set properly for clean, beautiful slices.
Serve: Slice and serve chilled, perhaps with a dollop of keto-friendly whipped cream. Leftovers can be covered and stored in the refrigerator for up to 5 days.
Don't overbake the pie! The residual heat will continue to cook the filling as it cools. A slight jiggle in the very center is perfect.
Let the pie chill completely.
Chilling for at least 4 hours is non-negotiable as it allows the filling to firm up for those perfect, clean slices.