OK....here is the ABSOLUTE simplest pie recipe....(other then buying and opening a pie).......
And, the mixture yields two 9" pies.
Ready?
1-One can of sweetened condensed milk....regular ~14oz.
2-One can of frozen lemon (or lime, or any other flavor will work) concentrate. I don't know the size, but it is the standard can like you get to make lemonade.
3- One container of Cool Whip. I use the larger bowl of the stuff.
4- Two 9" pre-made pie crusts.....(or you can make your own if you know how....it's just crushed Graham crackers and melted butter).
Combine the first three ingredients in a large bowl and mix thoroughly.
Pour evenly between the two pie shells and level smooth.
Let stand in the fridge (or freezer) until set to the consistency where it is slightly stiffer than pudding.
Ready to eat.