Preheat oven to 375F and line 2 baking sheets with parchment.
Thinly slice peaches and place in a large bowl. Add sugar, cornstarch, cinnamon, lemon juice, and vanilla. Mix well until combined.
Roll out pie dough to two 11" discs. Place disks on parchment lined baking sheets.
Divide peaches evenly between the two pie crusts leaving a 2" border.
Fold dough over and pinch to enclose peaches, leaving the center open.
Brush crust with egg wash and sprinkle with coarse sugar.
Bake for 35-40mins, until crust is golden and juices are bubbling.*
Cool on sheet for 10mins. Slide off with parchment onto wire rack to cool completely.
Store in fridge. Serve cold or reheated, on it's own or with ice cream or whipped cream.
Notes
* I baked one at a time and placed the other in the fridge until the oven was ready. If you bake both at once, baking time will need to increase. Also, be sure to rotate them while baking.This recipe makes enough for TWO 8" galettes.