Preheat the oven to 400 degrees F. Line a large baking sheet with parchment paper.
Roll out the pie crusts so they lie flat, dusting with flour as necessary to prevent sticking. Cut 3 rounds in each pie crust using a 6-inch diameter bowl or pastry cutter. Add 1/4 cup berries to the center of each pie crust round and fold the crust up over the filling. Brush with the egg wash and sprinkle with the crystal sugar. Bake until golden brown, 20 to 24 minutes. Cool slightly.