Sprinkle your work surface with a bit of flour. Using a floured rolling pin, roll out the first disc of pie crust so it's about 1/4-inch thick. Using a bowl that’s about 6-inches in diameter, cut 3 rounds in each pie crust, running a knife around the bowl. Repeat with the second pie crust disc.
Transfer the round of pie dough to the baking sheet. I like to assemble them on the baking sheet so there’s no need to move them. Brush the tops lightly with egg wash.
Spoon about 1 to tablespoons of the fruit mixture to the center of the pie crust round. I definitely fiddled with the placement of the fruit a bit so the slices laid on top of each other properly. Fold the dough sides over the filling—this doesn’t have to be perfect. Galettes are imperfect that’s why they’re awesome. Repeat with the remaining pie crust rounds. Sprinkle the top of the fruit with the streusel. I used a lot on top because I really wanted that flavor!
Transfer to the freezer to chill for about 10 minutes. Meanwhile, preheat your oven to 400 degrees.
When the oven is preheated and the galettes are a bit firm, brush the pie crust top with egg wash and transfer to the oven to bake for about 20 to 22 minutes, until the tops of the pie crust and streusel are golden brown and the fruit is bubbling.
Serve galettes with vanilla ice cream or whipped cream.