1. Stir together first 6 ingredients. Season with desired amount of salt and pepper.
2. Preheat oven to 400°. Unroll each piecrust. Lightly roll each into a 12-inch circle. Cut each piecrust into 6 circles using a 4-inch round cutter. Place about 3 Tbsp. turkey mixture just below center of each dough circle. Fold dough over filling, pressing and folding edges to seal.
3. Arrange pies on a lightly greased baking sheet. Brush with egg, and, if desired, sprinkle with poppy seeds.
4. Bake at 400° for 18 to 20 minutes or until golden brown. Serve with warm gravy.
Note: Unbaked pies can be frozen up to 1 month. Bake frozen pies 30 to 32 minutes or until golden brown.