Toss vegetables together in a microwavable-safe casserole dish; set aside.
In a small bowl, combine the garlic, water, teriyaki sauce and cornstarch; pour over vegetables. Cover tightly with plastic wrap and microwave on high for 4 minutes. Stir vegetables, recover and microwave an additional 3-4 minutes or until vegetables cooked to desired texture and sauce is thickened. Sprinkle with sesame seeds and serve immediately.