Preheat oven to 200°C (392°F), and lightly grease the insides of the muffin tin with butter or oil.
Using a round cookie cutter, cut 12 circles using the larger round cookie cutter into the just thawed pastry.
Carefully place the cut pastry into the bottom of the cups in the muffin tin. Gently press the pastry to the sides of each cup.
Divide the cooled filling evenly between the pastry lined muffin cups. (see note 2).
With the remaining pastry, cut 12 more circles. This time using the smaller cookie cutter. This will be used to top the pies.
Place the cut circles over the muffin cups, gently pressing around the edges to seal the pies. Trim any excess pastry from the edges.
Using a fork, poke some holes into the tops of each of the pies. Then brush the tops of the pies with some lightly whisked egg.
Place in preheated oven and bake for 20 to 25 minutes or until golden brown. Once baked, remove from oven and allow to cool slightly before serving.