When cooking a raw chicken casserole in the oven you cook the raw chicken casserole at 350 F degrees oven temperature.
While preparing your chicken casserole preheat the oven to 350 F degrees.
Then when the chicken casserole is ready to cook place it in the oven and allow the chicken casserole to cook for 30 minutes.
The chicken casserole will be done when the chicken is no longer pink in color.
The temperature of the casserole and chicken should be at least 165 F.
In my experience chicken casserole is done after 30 minutes of cooking in the oven.