You can keep it simple with Olive Oil and salt and pepper, or even just put a couple tablespoons of Italian salad dressing, I love to cook with Italian dressing, it is as light as the dressing I use (I use low calorie Good Seasons Italian), it flavors the chicken and the vegetables!! You could even throw in a handful of bowtie pasta!
I love the fajita style idea! Get some fresh tortillas and shred some cheese, add salsa---yum!
What about some tomato sauce and some pasta? Go Italian style! If you have squash or zucchini that would be good with it!
OK, now I'm hungry, LOL!!