To free you from the kitchen on the day that you are entertaining you can prepare the chicken by poaching it the day prior. The pesto may also be made in advance.
You could add some of the chicken to the base prior to going into the oven. This will crisp the chicken. Because it is lovely and juicy after being poached it will dry out if you do this so it is best to add it at the end of the cooking process.
This recipe will leave you with some poached chicken left over, or you can add another pastry sheet to the recipe and make another 5 pieces.