If using a glass Pyrex dish, first rule is NEVER add a hot item to a dish at room temperature, there is a chance the dish will shatter.
Second rule is never heat the dish when it is empty.
You need to heat the dish first, do this by adding water to the dish, about 1/2 inch, heat the dish for 10 minutes or so in the oven, remove from the oven, then pour in the rice mixture, then top with the chicken, cover with foil, then place in the oven to bake.
Bake for 35 minutes, then remove the cover or foil and bake for 10 more minutes or until all the liquid is absorbed by the rice and the rice is tender.
Remove from the oven and let rest for 5-10 minutes before serving, garnish with parsley and lemon zest.