Instructions:

Preparation of Ingredients: Begin by preparing all your ingredients. Cut the chicken into bite-sized pieces, chop the vegetables, and mince the garlic and ginger. This ensures a smooth cooking process.
Mixing the Sauce: In a bowl, whisk together soy sauce, oyster sauce, rice vinegar, brown sugar, sesame oil, chicken broth, and cornstarch. Ensure the mixture is well combined and set aside.
Cooking the Chicken: Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat. Season the chicken pieces with salt and pepper, then add them to the skillet. Cook for about 4-5 minutes or until the chicken is golden and cooked through. Remove the chicken from the skillet and set aside.
Sautéing the Vegetables: In the same skillet, add the remaining tablespoon of oil. Add the chopped onions, bell peppers, minced garlic, and ginger. Sauté for about 3-4 minutes or until the vegetables are tender but still crisp.