Of course not. Chicken breasts are by far the easiest to cook Chicken Florentine, but you can fill the pot with drumsticks or things and be just as content. But of course, chicken breasts have no bones. At home though, as long as the chicken is cooked thoroughly, we don't see any problem. Just remember though, that if you add more chicken, you'll need to increase the volume of the oil, the butter, and the whipping cream and that in and of itself requires some experimentation. You can also use cubed chicken or even cubed turkey. But the object is to have a mild manner dish accented by the flavors. Therefore, stick with either chicken or turkey. Beef or pork is likely too strong and will counteract much of the flavors.