Preheat oven to 425 degrees. Line a baking sheet with parchment paper or aluminum foil for easy clean up.
Place peaches and blueberries a large bowl. Add sugar, flour, ginger, cinnamon, lemon zest, lemon juice, vanilla and salt. Fold with a spatula until evenly combined, set aside.
Place chilled dough on a lightly floured surface. Roll out to a 10-12” circle (it doesn’t have to be uniform!).
Pile the peach blueberry filling in the center of the circle and fold up the sides of the dough. Place butter on pieces on top of the peach filling
Brush with egg wash and bake 15-20 minutes or until filling is bubbly and crust is golden.