Special equipment: 4 1/2-inch round biscuit cutter
Preheat the oven to 350 degrees F and line a baking sheet with parchment paper.
Roll out the pie crusts with a rolling pin on a lightly floured surface to 1/8 inch thick. Cut out rounds of dough with a 4 1/2-inch round biscuit cutter and transfer them to the prepared baking sheet. Gather and reroll the scraps if necessary; you should have a total of 12 rounds.
Spread 1 teaspoon sweet potato in an even layer over half of each round, leaving a 1/4-inch border around the edge. Top each with 2 teaspoons stuffing, then 2 teaspoons turkey, and finally 1 teaspoon cranberry sauce. (You may redistribute some of the filling among the rounds so all the piles are even.) Whisk together the egg and milk in a small bowl to make an egg wash. Brush the egg wash around the edges of each dough round.
Fold over each dough round to cover the filling, creating 12 half-moon shapes. With your fingers, press the edges together to seal, and then press with a fork to seal securely.
Brush the top of each hand pie with the remaining egg wash. Make 3 small slits with a small paring knife on the top of each pie to let the steam escape. Bake until the dough is cooked through and golden brown, about 30 minutes. Serve warm with extra cranberry sauce and gravy on the side for dipping.
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