Roll out the pie dough into a rough circle about ⅛″ in thickness.
Use a large round cookie cutter or small plate, measuring 5" in diameter, and cut out 8 circles. Stack them on a plate and place them in the fridge. These will be the top crusts.
Take the scrap pieces of dough and press them into the mini cocottes as the bottom crust. It doesn't need to be pretty!
Fill each cocotte with the pot pie filling about ¾ full, then mound a little extra in the center, careful not add too much liquid.
Take each pastry circle and place them on of the filled cocottes. Fold the edges of the pastry underneath and crimp as desired.
Place the assembled mini pot pies in the fridge for the pastry to firm up for at least 20 minutes. We don't want them to lose their shape in the oven.
Meanwhile, preheat the oven to 350 degrees F.
Take the mini pot pies out of the fridge and place them on a large baking sheet. Cut a few slits in the top crusts, then brush an egg wash all over, even the crimp.
Bake the mini chicken pot pies for about 40-45 minutes or until the filling is bubbling and the top crusts are evenly golden.
Allow them to cool for a few minutes before serving.