1. At least two hours before dinner, combine sliced chicken, garlic, and teriyaki sauce in a bowl.
2. Stir, cover, and refrigerate until dinner time.
3. Heat wok, or wok-style pan, to high heat; add oil.
4. Add chicken and stir until cooked, then add veggies.
5. Continue to stir and cook until veggies are firm, then add crushed red pepper flakes to taste and garnish with sesame seeds.
6. Serve immediately over rice.
7. Note: If you find that your sauce was too liquid the first time you prepare this, try adding a teaspoon of cornstarch to the teriyaki chicken mixture before stir frying next time.