Heat the oil in a wok over high heat. Add the garlic, ginger, and scallions. Cook until aromatic, about 2 minutes. Add the chicken. Saute until the edges are brown, about 3 to 4 minutes. Add the broccoli, carrots, and green beans to the wok. Cook approximately 5 to 8 minutes, until the vegetables begin to become tender. Add the red pepper, mushrooms, bok choy, and teriyaki sauce to the wok, cook approximately 5 to 8 minutes more, or until chicken is cooked through and vegetables are done to your likeness. Taste and adjust seasonings. Serve immediately.