After chilling, remove the pie dough from the fridge and place on a lightly floured work surface. Grab a rolling pin and dust with flour
Roll the pie dough out until it is about ⅛" thick. It can be a little over, just keep it thinner than ¼"
Use a 2" circle cutter to cut out the pie dough discs and transfer to sheet pan. Collect any remaining scraps, pat together, and wrap in plastic to return to the fridge
In the meantime, combine the egg and heavy cream in a small dish and whisk until combined. Set aside in the fridge until ready to use
Lay about 12-15 pie dough cutouts on your prepared cookie sheet, allowing about 2" in between each disc
Place 1/2 teaspoon of blueberry pie filling into the center of each cookie disc
Brush a little egg wash around the edge of the pie crust
Grab another dough cutout and place it on top of the blueberry jam. Lightly press the edges around the filling to glue them together, then grab a fork and crimp the edges closed
Pop the pan in the freezer and freeze until firm for about 15 minutes
Preheat the oven to 400°F and repeat the entire process of creating the cookie discs and filling them with blueberry pie filling with the remaining dough in the fridge