Preheat the Oven:Preheat your oven to 350 degrees F (175 degrees C) and lightly grease a 9 inch pie pan.
Prepare the Crust: In a bowl, combine almond flour, melted butter, erythritol, vanilla, and salt until a dough forms. Press it evenly in the pie dish to the bottom and sides.
Prebake the Crust: Bake for 10 minutes on lower rack. Remove, then leave to cool a bit while you make the filling.
Mix the Filling: In a large bowl whisk pumpkin puree, sweetener, eggs, heavy cream, vanilla, and all spices together until smooth and creamy.
Fill the Crust: Scrape the pumpkin filling into the cooled crust and smooth the top with a spatula.
Bake the Pie: Bake for 40–45 minutes, or until the centre is barely set. Some wobble in the middle is fine.
Cool & Rest: Cool to room temperature, then chill 2 hours before serving.