#### Prepare the Crust:
In a mixing bowl, combine the graham cracker crumbs, granulated sugar, and melted butter. Mix until the texture resembles wet sand.
Press the mixture evenly into the bottom and up the sides of a 9-inch pie pan. Chill in the refrigerator for at least 30 minutes to firm up.
#### Make the Filling:
In a large mixing bowl, beat the cream cheese and powdered sugar together until smooth and creamy.
Gradually add the eggnog, nutmeg, and cinnamon, mixing until fully combined.
Gently fold in the whipped cream until no streaks remain.
#### Assemble the Pie:
Pour the eggnog filling into the prepared crust, smoothing the top with a spatula.
Cover and refrigerate for at least 4 hours, or until set.
#### Add the Topping:
Before serving, top the pie with whipped cream and sprinkle with additional nutmeg for a festive touch.