In a large mixing bowl add the eggs, sugar, cinnamon, nutmeg and vanilla and whisk well.
Put 1 cup of cream and the pumpkin puree in a saucepan and bring to a simmer on low heat, stirring constantly. Once the cream has begun to simmer, spoon about 1 cup of the pumpkin mixture into the egg mixture and whisk until incorporated. Pour the egg mixture into the pumpkin mixture, whisk together and simmer for 1 minute. Remove from the heat and set aside to cool for 5 minutes.
Arrange a layer of chocolate wafers in the bottom of a 9-inch springform cake pan. Overlap the cookies a bit.
Whisk the mascarpone into the cooled pumpkin cream. Pour about 1 cup of pumpkin cream over the cookie layer in the pan. Spread the cream evenly with a spatula. Add another layer of cookies over the cream and more cream over the cookies. Repeat until all of the cookies and cream are used. You should end up with a layer of cookies on top.
Whip the remaining 1 cup heavy cream with 1 tablespoon sugar with a whisk or an electric mixer, until you have stiff peaks. Spread the cream over the pie. Cover with plastic wrap and refrigerate for at least 4 hours, or overnight.
Remove the ring from the cake pan, sprinkle the top of the pie with toasted pumpkin seeds and serve.
Use all of the cookies, even the broken bits. The cookies will meld into the cream as the pie sets, so you don't have to worry about using whole ones.
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