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. Remove from heat.
Garnish with sesame seeds and chopped green onions. Serve immediately.
Notes
Feel free to customize with your favorite vegetables or add tofu for extra protein.