Butter a rectangle casserole dish. Add the chicken, broccoli, and rice.
In a large pot, combine the chicken stock, milk, butter, bouillon cubes, and other seasoning. Heat over medium heat and stir until everything is well combined.
Place the casserole pan on a baking sheet. Pour the liquid over the rice and chicken mixture in the casserole pan. Cover with aluminum foil.
Bake at 350°F for 1 hour and 15 minutes. During the last 15 minutes, remove the foil and add the French fried onions or cheese to the top.