Add carrots and broccoli, stir-fry 2-3 minutes. Add bell peppers, snap peas, mushrooms, and water chestnuts, cook another 2-3 minutes until crisp-tender.
Pour sauce over vegetables and stir-fry 1-2 minutes until thickened and coated. Garnish with sesame seeds and green onions. Serve immediately.
Notes
Feel free to customize with your favorite vegetables or add tofu for extra protein.