Pre-heat your pie maker or your oven. Cut your pastry into circles for the base and for the top. If you're using a pie maker, they usually come with a tool for this but if you're using a muffin tray, you may have to do a little guess work. Line each pie tray with pastry and spoon in the chicken mixture into the pastry. Top with a circle of pastry and close your pie maker. Cook for approximately six minutes or until golden brown. As a tip, if you have leftover bits of pastry, combine them in a ball and roll it out with a rolling pin before cutting more circles.