Preheat the oven to 425˚F (220˚C).
If the pie dough has been refrigerated overnight, let it sit at room temperature until pliable (this could take up to 30 minutes, depending on the temperature of your kitchen). Roll out one of the pieces of dough on a lightly floured piece of parchment paper into a 10- to 11-inch square. Using a straight edge (such as a ruler) and a pizza cutter, trim the edges so that they’re straight (save the scraps!). Cut the dough into 9 even squares (I just wing it, but you could measure the squares if precision is your jam).
Slide the parchment (with the dough squares) onto a baking sheet and refrigerate. Repeat with the next piece of dough.
Remove the first baking sheet from the fridge—you’ll be baking the pies right on this baking sheet. Place a piece of almond paste in the center of each square of dough. Scoop a scant tablespoon of the blueberry filling over the almond paste—you will have leftover filling (you can use the leftover filling to make a rustic little crostata with the dough scraps, or you can stir in into yogurt or ice cream).
Remove the second baking sheet from the fridge, and top each pie with a square of dough. Press along the edges of the dough with a floured fork to seal (if your pan is small and this is cumbersome, move the pies to a work surface with a spatula to seal). If the dough tears or cracks, just patch it back together the best you can. At this point you might be thinking, “these look like hell,” as some of the filling will poke through and the dough won’t be perfect—it’s okay! The pies look quite lovely when baked, even if they look bedraggled before going into the oven. Remember, it’s all about embracing the process (and that pie is supposed to be fun).
Cut a small vent into the top of each pie (I usually do 4 small cuts—see the photos). Refrigerate the pies for 5 minutes.
Brush the tops of the hand pies lightly with milk, then sprinkle with the turbinado sugar. If there’s any flour on the parchment paper, brush it off. Bake the hand pies until golden brown, about 18-20 minutes. Transfer the pan to a cooling rack and let them cool for at least 15-20 minutes before serving. Serve warm or at room temperature.