Remove half of the cookie balls from refrigerator. Using 2 forks, dip and roll chilled cookie balls, one at a time, in melted chocolate. Return to lined cookie sheet; immediately sprinkle top with crushed cookie crumbs. If chocolate has cooled too much, reheat. Refrigerate truffles about 10 minutes or until coating is set. Repeat with second half of cookie balls. Store covered in refrigerator.