Combine the first six ingredients in a bowl and set aside to marinate, two hours is good, I usually marinate overnight
When ready to bake pull the chicken out of the fridge to bring to room temperature and preheat the oven to 350F
Lightly grease an oven safe casserole dish then sprinkle on the onions, then tomato sauce (spread with a spoon), then scatter the chicken and broccoli over top and finally the green chilies
Cover and bake for 20 minutes then pull it out, flip the chicken over, add a splash of water if it looks dry and put it back in the oven for another 10-15 minutes or until it breaks easily with a fork.
Scatter over with fresh cilantro leaves and serve as is or with your carb of choice (brown or white - no judgments here!)