Preheat oven to 375ºF & prepare casserole dish. Next, prep veggies by dicing the yellow onion and chopping broccoli into chunks. Sprinkle veggies in to casserole dish.
Prep chicken & place on top of veggies. Add germinated brown rice and set aside. In a medium size bowl, mix together all ingredients for the sauce.
Add sauce mixture to the casserole dish and mix all ingredients together, making sure everything is covered. Cover with tin foil and bake for 30 minutes.
Remove and stir. Place back in oven for 30 minutes, covered. When casserole is done, take out and let sit for 10 minutes before serving.