Heat 1 tablespoon oil in a saute pan over medium heat. Add garlic and stir. Place the chicken in the pan and brown 4 minutes on each side. Remove from pan, slice into strips, set aside.
Heat remaining tablespoon of oil in a wok over high heat. Add the vegetables and teriyaki sauce. Stir-fry quickly until the vegetables begin to soften. Add the chicken strips, combine well and continue to cook for 2 to 3 minutes. Serve immediately.