Key Lime Pie!

1 ready made graham cracker pie crust (or make your own)
1 14oz can sweetened condensed milk
1/2 cup key lime juice
3 egg yolks (discard whites or keep & make meringue)
half a container of cool whip
1 lime zest

Mix milk, juice, egg yolks until thick. Pour into pie shell bake at 350*F for 15 minutes. Take out & let cool for 20 minutes & then refrigerate. After the pie is completely cooled, put half a container of cool whip on top & grate some lime zest on top. (totally optional)
This was super fast to make, easy & delish.