Preheat oven to 375 degrees.
Take the chilled pie dough out of the refrigerator and let it sit at room temperature for a few minutes to make it more pliable.
Place your dough on a lightly floured surfaceand use a floured rolling pin to roll out the dough to about 1/8 inchthick.
Flour a couple of muffin tins and using a round cookie cutter or glass with a diameter slightly larger than the muffin tin cups, cut out circles from the rolled dough.
Carefully press each dough circle into the greased cups of the mini muffin tin, gently shaping them to fit snugly.
Spoon the prepared apple mixture into each dough-lined cup, filling them almost to the top. Be sure not to overfill as the filling may leak out during baking.
Once all the cups are filled, you can neatly fold over the excess dough to form the pie crust OR cover each pie with the sugar crumble.
Lightly brush the exposed edges of the pie with egg wash.
Bake for approximately 20 to 25 minutes, or until the crust is golden brown and the apple filling is bubbling.
Allow them to cool a few minutes before serving.