In a large bowl, beat the softened cream cheese until smooth.
Add the sugar and vanilla extract, and mix until combined and creamy.
Fold in the thawed whipped topping gently until no streaks remain.
Stir in the mini chocolate chips.
Spoon the mixture into the prepared cookie crust and spread evenly.
Chill in the refrigerator for at least 4 hours or until set.
Top with extra chocolate chips or whipped cream if desired before serving.