Open one box of Jello and prepare according to box directions.
Pour Jello evenly and equally into cups.
Let Jello sit in fridge for at least 3 hours or until fully set.
Open second box of Jello and prepare according to box directions.
Mix Jello liquid with Cool Whip and stir to combine. Pour on top of set up Jello in cups and refrigerate for another 3 hours or until Jello/Cool Whip mix is firm.
Spoon 1/2 cup greek yogurt on top of each cup.
Notes
You can make these into smaller portions for little ones or if you are serving a crowd just cut down the amount of each portion you put into each cup.