For crust ...Preheat oven to 350°
In a food processor, pulse the cookies until finely ground.
Transfer to a medium bowl and add the butter and sugar. Mix until well combined.
Press into a 9-inch pie plate (using the back of a small measuring cup helps form a perfect crust).
Bake the crust for 8-10 minutes, until set.
Transfer to a rack and let cool prior to filling.
For the filling ... Purée pumpkin in food processor.
Mix in next 6 ingredients.
Gradually add cream, processing just until blended.
Pour filling into crust.
Bake in 350° oven for about one hour, or until center is set.
Cool completely on rack.
Top with whipped cream and chocolate shavings if desired.