In a bowl, mix together the berries, sugar, cornstarch, and lemon juice. Mix to combine and mash up the berries into smaller pieces with a fork.
Then roll out your pie dough to a 1/8-inch thickness. Use a cookie cutter to cut out 20-24 shapes. Set half of the cut pie pieces to the side.
Brush the border of the remaining pieces with egg wash. Then spoon 2-3 tablespoons of the berry pie filling into the center of each.
Next top them with the remaining pie dough pieces. Press the edges together with the tines of a fork to seal. Place the pies on a baking sheet lined with parchment paper or a silicone mat.
Brush with the egg wash and sprinkle with coarse sugar.
Bake the pies 20-22 minutes until golden brown. Allow to cool for at least 10 minutes before eating.