Combine the chicken pieces, half of the soy sauce, half of the sesame oil, and half of the cornstarch in a bowl. Leave to marinate for 5-10 minutes.
Combine the cooking wine, remaining soy sauce, remaining sesame oil, remaining cornstarch, black vinegar, catsup, and sugar in a bowl.
Heat vegetable oil in a wok.
Sautee garlic and dried chili until aromatic.
Add chicken and marinade. Sautee for 2-3 minutes.
Add onions and bell peppers. Sautee for a minute.
Stir in the sauce mixture. Simmer until thick.
Top with roasted peanuts.