Preheat oven to 350 degrees. Cut about 2 tablespoons of pie dough off of the rest of the pastry and set aside. Roll out remaining pie crust just as you would to make a pie. Place pie crust on a baking sheet lined with parchment paper or silicone baking mat. Set aside.
In a large bowl, gently combine the berries with flour, sugar and salt. Pour into the center of the pie crust, spreading the berries evenly leaving a 1 1/2 inch border. Fold up the sides to create the galette.
Roll out remaining dough and cut out stars with small cookie cutters. Place stars over top berries.
Brush edges and stars with milk. Sprinkle additional sugar over top if desired.
Bake 20 minutes or until crust has browned and berries are bubbly. Cool at least 15 minutes before cutting. Serve with whipped cream or vanilla ice cream.