Place a baking sheet on the lower rack of the oven and preheat the oven to 400°F.
Roll out the bottom crust on a floured board until it will fill a standard glass pie plate with about an inch or so overhang around the rim.
In a large bowl combine the peach wedges, sugar, lemon, vanilla, cinnamon, nutmeg and salt. Then slowly add the cornstarch, mixing well until it’s fully incorporated. Place the filling on the bottom crust.
Dot the top of the filling with the diced butter.
Roll out the top crust and place on the pie. Crimp the edge of the topand bottom crusts to seal the pie. Makea number of slits in the top crust to allow steam to vent.
Brush the top crust with some beaten egg, (known as an egg wash), and then lightly sprinkle with the granulated sugar.
Wrap the edge of the pie with narrow strips of aluminum foil to prevent it from over-browning. Place the pie on the baking sheet and bake for 15 minutes.
Remove the aluminum foil and continue baking for another 30-40 minutes, or until the top has lightly browned and the filling is soft and bubbly. Allow the pie to cool before slicing.