In a skillet, brown beef; drain. Dissolve bouillon in 1-1/2 cups boiling water; add to skillet. , Combine remaining water with cornstarch; stir into beef mixture. Bring to a boil; reduce heat and simmer until thickened. Add vegetables and soy sauce; stir and cook until heated through, about 15 minutes. , Serve over rice; sprinkle with chow mein noodles.