Marinate cubed chicken in soy sauce, wine, and cornstarch for 15 minutes at room temperature.
Combine all sauce ingredients in a small bowl and set aside.
Heat oil in a wok or large skillet over high heat until smoking.
Add marinated chicken and stir-fry for 3-4 minutes until golden brown and cooked through. Remove and set aside.
In the same pan, add dried chilis and Sichuan peppercorns, stir-fry for 30 seconds until fragrant.
Add minced garlic and ginger, stir-fry for another 30 seconds.
If using, add bell pepper and celery, stir-fry for 1-2 minutes until crisp-tender.
Return chicken to the pan and pour in the prepared sauce.
Add peanuts and toss everything together for 1 minute.
Remove from heat, garnish with chopped green onions, and serve immediately over steamed rice.