The asparagus variation of this is also great -- snap ends off 1 bunch asparagus, chop into 2" pieces, steam ~5 min until about halfway done, and throw into the mixture instead of the green beans.

I also use chicken thighs instead of breasts -- gives it even more flavor and richness, and ups the fat ratios too. I brown the thighs, then pull them into shreds and mix them in with the veggies instead of placing them whole into the casserole dish.