2/3 c. boiling water in a medium bowl.
Stir in Jello to dissolve. Make sure the water is boiling; if the sugar doesn't completely dissolve it will come out grainy.
Stir in tub of defrosted Cool Whip with whisk. Put bowl into fridge for 20 minutes to firm up. Spoon into crust, freeze 2 hours. Defrost 10 minutes before serving with fruit and whipped cream.(Stick with Cool Whip for a Gluten Free version)
It is so easy to make kids happy! (I tested this on actual kids just to be sure :)
I think it might be possible to make a grownup version using alcohol for part of the cold water proportion, but I have not tried it. It might not gel properly and come out soggy, but then again it might be worth a try! Peach Jello with Raspberry Stoli maybe?