Preheat the oven to 350 and place a rack in the center of the oven.
Line a deep dish pie plate with a crust (make your own or use a refrigerated pie crust, see note section). Then set the pie plate aside.
In a large bowl, mix the sugar, flour and salt until evenly blended. Use a whisk to make sure that lumps are broken down. Add the 2 cups of whipping cream and mix well but do not whip or beat.
In a separate smaller bowl, mix the half and half, egg yolks and vanilla together well. (Use a whisk but do not whip or beat).
Then, pour the egg yolk mixture into the sugar mixture and blend together well - do not beat.
Pour the mixture into the pie shell and dot the butter pieces around evenly on top of the pie
Sprinkle the top of the pie with cinnamon
Bake at 350 “Until it bubbles through for 10 minutes” (in a regular oven - about an hour, but check the pie by wiggling the edge of the pie plate - if the pie is still loose in the center, it isn’t quite done - as soon as it no longer loosely and sloppily jiggles, it is done - it will still be jiggly like Santa's tummy in the center).