1. Place peach wedges into a medium mixing bowl and sprinkle with granulated sugar. Toss gently and cover with plastic wrap. Set aside at room temperature for one hour, stirring 1-2 times.
2. Take pre-baked pie crust, break into pieces and add to the food processor. Process until small crumbs. Place crumbs into a small mixing bowl. Add enough milk to cover the crumbs , stir to combine and set aside for 15 minutes until they completely absorb all the milk to make a slurry. Once the crumbs are all soften, you can stir until the slurry is a smooth pudding consistency. If too thin, add enough food thickener until you get a pudding consistency. If too thick, add more milk to make it a smooth pudding consistency. Spread the slurry into the bottom of a pie plate.
3. To make the custard, mix the milk, sugar, cornstarch and whole egg in a medium saucepan. Whisk until well blended. Cook over medium heat until the custard thickens and comes to a boil. Boil one minute stirring constantly. Remove from heat and add vanilla and butter. Stir until well blended. Pour over the pie crust, cover with plastic wrap directly on top of the custard to seal and prevent a film from forming and refrigerate until chilled, at least three hours.
4. To make the peaches, drain the juice into a medium saucepan. Add the peaches to the food processor to blend until they are puréed into a smooth consistency. Set peaches aside. To the juice, add 1/4 cup water, cornstarch, cinnamon and salt to the juice. Cook over medium heat whisking constantly until the syrup boils. Simmer for 2-3 minutes or until thickened. Remove from the heat and add the butter and vanilla. Gently fold in the peaches. Add food thickener as needed to make a smooth pudding consistency. Spread peach layer on top of the custard layer. Cover and refrigerate while making the cream whip topping.
5. To make the cream whip so that it solidifies, won't melt and will hold the stiff peak for several days; add one cup cold heavy whipping cream, cornstarch and powdered sugar to the food processor. Pulse 6-8 times until cream starts to thicken. Add vanilla or almond extract and blend until stiff peak. Spread the cream whip on top of the peach layer. Add dashes of cinnamon to the top for garnish. Keep pie refrigerated.