Okay, I would never cook chicken from frozen but when DSIL was in hospital, a neighbour brought over a fabulous casserole made with leftover chicken--a cup or two of chopped cooked chicken, some frozen veggies thawed (or leftovers) a can of cream of chicken soup. (and when I tried to replicate it I added about a cup of shredded cheese) Put all in a casserole and put in a 400 degree oven for about 1/2 hour to heat thru. Then top with a cup of bisquicik mixed to the package directions and bake for the required time. OMG it was fabulous!! The DGkids ate their "I don't like that" words!!