Preheat and prep: Heat your oven to 350°F (175°C). Lightly grease a 9-inch pie plate.
Mix the crust: In a bowl, combine 2 cups almond flour, 3 tablespoons granular keto sweetener, a pinch of salt, and 5 tablespoons melted butter.
Stir until the mixture resembles damp sand and holds together when pressed.
Press and par-bake: Press the crust evenly into the pie plate, pushing up the sides. Dock the bottom with a fork. Bake for 10–12 minutes until just set and lightly golden at the edges.
Let it cool for 5 minutes.
Whisk the filling: In a large bowl, whisk together 1 3/4 cups pumpkin puree, 2/3 cup granular keto sweetener, 1 cup heavy cream, 3 large eggs, 1 1/2 teaspoons pumpkin pie spice, 1 teaspoon vanilla, and 1/4 teaspoon salt. Whisk until smooth and glossy. Taste and adjust sweetness (a few drops of liquid stevia can round it out).
Fill and bake: Pour the filling into the warm crust.
Bake at 350°F (175°C) for 40–50 minutes, until the edges are set and the center still has a slight jiggle. If the crust browns too quickly, tent the edges with foil.
Cool and set: Let the pie cool at room temperature for at least 1 hour, then chill for 3–4 hours to fully set. This improves texture and clean slices.
Serve: Slice and top with lightly sweetened keto whipped cream.
A dusting of cinnamon is a nice touch.