Gather all Ingredients
Whisk orange gelatin and boiling water together in a medium bowl until completely dissolved and slightly cooled ,about 2 minutes.Whisk in orange zest and juice until combined .Set aside
Whisk cream cheese in a large bowl until smooth,about 30 seconds.Gradually whisk in gelatin mixture until smooth
Whisk 11/2 cups whipped topping until smooth and no lumps remain;
Pour filling into graham cracker crust and spread evenly.Cover and refrigerate until set,at least 4 hours or up to overnight
Arrange mandarin decoratively over the top, Sprinkle with zest,and serve