In a greased 3-qt. baking dish, combine the broth, rice, 1 cup onion, soy sauce, butter and thyme. Cover and bake at 350° for 65-70 minutes or until rice is tender., Meanwhile, in a large skillet, saute the cauliflower, broccoli, peppers, garlic and remaining onion in oil until crisp-tender; spoon over rice mixture. , Cover and bake for 10 minutes. Uncover and sprinkle with cashews and cheese if desired. Bake 5-7 minutes longer or until cheese is melted.