Whip the heavy whipping cream in a large mixing bowl until soft peaks form. Gradually add powdered sugar and vanilla extract while continuing to whip until stiff peaks form.

In another bowl, beat softened cream cheese until smooth, then mix in sour cream until fully combined.

Gently fold the whipped cream into the cream cheese mixture without deflating the whipped cream.

Sprinkle in the crushed chocolate sandwich cookies and mini chocolate chips, folding them gently into the mousse.

Spoon or pipe the mousse mixture into serving cups, filling them about three-quarters full.

Cover with plastic wrap and refrigerate for at least 2 hours until fully set.

Garnish with additional crushed cookies and whipped cream before serving.