4 Ingredient Frozen Pie: 1box jello 2 6oz containers yogurt (not greek) 8oz whipped topping prepared graham crust Dissolve jello mix in 1/4C boiling water. Whisk in yogurt, then fold in cool whip. Pour into prepared crust and freeze for at least 2 hours, or overnight preferably. You can change out the yogurt and jello flavors. I make this with SF jello and sometimes lowfat yogurt and it works just fine.