Preheat oven to 375°.
Place cookies in a food processor; process until finely ground. Add butter and egg white; pulse 2 or 3 times or just until combined. Press into bottom and up sides of a 9-inch pie plate coated with cooking spray. Bake at 375° for 8 minutes; cool completely on a wire rack.
Combine cream cheese and sugar in a large bowl; beat with a mixer at medium speed until smooth. Gradually add crème de menthe, beating well. Fold in whipped topping. Spread pie filling into prepared crust. Cover and chill at least 8 hours.