Preheat the oven to 350ºF.
Place the walnuts & butter in your food processor or blender.
Pulse for 2 minutes until the nuts are in tiny pieces & blended in with the butter.
In a large bowl add the pumpkin puree & eggs. Use a whisk & mix well.
Once mixed add in heavy cream & mix.
Mix in pumpkin spice, salt, & monk fruit.
Pour the pumpkin pie filling into the pie crust.
Bake at 425 for 10 mins, then turn down to 350 & bake for another 30 mins.
Check that its fully cooked with a toothpick.
The toothpick will come out clean when they are.