Not exciting, but poached chicken and boiled rice. As clean as it gets! Add some steamed broccoli to spice things up.
More seriously, if you have skills in the kitchen, make a vegetable based tomato sauce like you would use for pasta. Garlic, tinned tomatoes, fresh basil, heaps of veg like capsicum and zucchini. Spray oil in pan, quickly soften garlic (can add finely chopped onion, but watch the carbs), brown cubed chicken, chuck in veg for a couple of minutes, add tin of tomatoes and reduce. Just before at the type of consistency you like, add in some torn basil. Season with salt and pepper. Serve on top of cokked brown rice.
Also make friends with a crock pot. Can make awesome stews.