• Preheat the oven to 350 degrees Fahrenheit.
• Spread the prepared pie crust into the bottom of a 9inch pie dish. Press it down into the bottom and corners of the dish. Set it aside until needed.

For the Pie Filling:

• Add the sugar, egg yolks, sour cream, flour, vanilla, and salt to a medium sized bowl and stir them together until combined.
• Add half the sliced peaches into the bottom of the prepared pie crust.
• Pour half the custard over the top of the peaches.
• Add the remaining peaches to the dish, and the rest of the custard over the top.

For the Streusel Topping:

• Add the flour, brown sugar, cinnamon, and nutmeg to a medium sized bowl. And whisk them together.
• Add the cubed butter to the streusel mixture and cut them together until you have a nice fine crumb.
• Sprinkle the crumb topping over the top of the peaches and custard.
• Bake the pie for about 1 hour, or until the custard is set. The inner couple inches can be slightly jiggly, but the outside should be set.
• Let the pie cool to room temperature, then slice it up to serve. If not serving after pie is cooled, keep pie covered in the fridge..