Preheat oven to 350°F (175°C).* Lightly grease a 9-inch pie pan or tart pan with a removable bottom.
Combine the cookie crumbs and sugar until thoroughly mixed. Stir in the butter until thoroughly moistned.
Press into the bottom and up the sides of the prepared pan.
Bake 12 minutes. Set aside to cool.
To make the filling:
Using an electric mixer on medium speed, beat the cream cheese, sugar, Irish cream, and vanilla extract until thoroughly combined and smooth.
In a separate bowl, use an electric mixer with a whisk attachment to whip the cream until soft peaks form.
Fold about 1/3 of the whipped cream into the cream cheese mixture. Then gently fold in the remaining whipped cream.
Spread the filling evenly in the pie pan. If desired, garnish with chocolate sprinkles, curls, or shavings. Refrigerate at least 4 hours before serving. (Overnight is even better!)
Notes
*I like to bake cookie crusts briefly to make them a bit firmer. If you want to skip the oven time, simply chill the crust for about half an hour before adding the filling.
Store tightly covered in the refrigerator up to 5 days.