Prepare the crust: Combine graham cracker crumbs and 1/4 cup sugar in a medium bowl. Pour in the melted butter and mix until the crumbs are evenly moistened. Press the mixture firmly into the bottom and up the sides of a 9-inch pie plate. Place the crust in the freezer while you prepare the filling.
Make the filling base: In a large bowl, whisk together the instant vanilla pudding mix and cold milk for about two minutes until the mixture begins to thicken.
Add eggnog and flavor: Gently whisk in the chilled eggnog and vanilla extract until just combined and smooth. Do not overmix.
Fold in whipped topping: Carefully fold in the thawed frozen whipped topping until no streaks remain. You want the filling to remain light and airy.
Assemble the pie: Pour the velvety eggnog filling into the chilled graham cracker crust. Spread the top evenly with a spatula.
Chill: Cover the pie loosely with plastic wrap and refrigerate for at least 6 hours, or preferably overnight, until the filling is completely set.
Serve: Before serving this easy eggnog pie, sprinkle the top generously with ground nutmeg. Slice and serve cold.
Notes
If you prefer a gingersnap crust for a spicier flavor, substitute gingersnap crumbs for the graham cracker crumbs.
For a richer flavor, you can substitute 1/2 cup of the milk with a splash of dark rum or bourbon, if desired.
This is a perfect make ahead holiday dessert; it holds up well in the refrigerator for up to two days.