Blend the first 6 ingredients together, to make a crust and spread in a ungreased 9x13 inch pan. Bake at 350* for 12-15 minutes, Cool.
In a large bowl; combine the cream cheese, tang, and sugar beating 3 minutes until smooth. Add 3 eggs, one at a time beating well, Fold in 2 regular tubs of cool-whip whipped topping and mandarin oranges,
Pour over cooled crust, cover with foil and freeze overnight, serve slightly thawed... Enjoy!