In a large mixing bowl, add sliced peaches, lemon juice and vanilla.
In a small bowl, whisk together cornstarch, brown sugar, cinnamon, nutmeg and salt until combined. Pour over the peaches and gently toss to combine.
Roll out the dough into a 14-inch circle on a sheet of parchment paper. Carefully place the parchment paper with dough onto a baking sheet.
Arrange the peach slices in the middle of the circle in a decorative pattern, leaving a 2-inch wide border. Fold the edges of the dough over the peaches, allowing the dough to overlap when necessary. Pour any remaining juices over the peaches.
Brush the edges of the dough with cream, and sprinkle with Demerara sugar.
Bake for 45-50 minutes or until the peach juices are bubbling and the crust is golden brown.
Remove from oven and allow to cool on a baking rack. Serve warm with vanilla ice cream , if desired.
Cook's Note: Papa's Pie Crust Recipe: http://www.cookingmamas.com/papas-pie-crust.html