1. Combine marinade ingredients in a bowl. Stir to coat chicken well. Let stand 10 minutes.
2. In another bowl, combine all sauce ingredients.
3. Place a wok over high heat until hot. Add 2 tablespoons oil, swirling to coat sides. Add chiles and cook, stirring, until fragrant, about 10 seconds.
4. Add chicken and stir-fry 2 minutes. Remove chicken and chiles from wok.
5. Add remaining 1/2 tablespoon oil to wok, swirling to coat sides. Add garlic and cook, stirring, until fragrant, about 10 seconds.
6. Add celery, bell pepper and bamboo shoots; stir-fry for 1 1/2 minutes.
7. Return chicken and chiles to wok; stir-fry 1 minute.
8. Add sauce and bring to boil. Add cornstarch solution and cook, stirring, until sauce boils and thickens. Add peanuts and stir to coat.