Creating this mouthwatering Black Pepper Chicken is simple when you follow these steps:

1. Marinate the Chicken: In a bowl, combine the chicken pieces, soy sauce, oyster sauce, cornstarch, and half the black pepper. Mix well, ensuring the chicken is fully coated. Allow it to marinate for at least 10 minutes.

2. Prepare the Ingredients: While the chicken marinates, slice the bell peppers, onion, and prepare the garlic and ginger.

3. Heat the Oil: In a large pan or wok, heat the vegetable oil over medium-high heat until shimmering.

4. Cook the Chicken: Add the marinated chicken to the hot pan in a single layer. Cook for about 5-7 minutes, or until the chicken is golden brown and cooked through. Remove the chicken from the pan and set it aside.

5. Sauté the Vegetables: In the same pan, add the sliced onions, bell peppers, garlic, and ginger. Stir-fry for about 3-4 minutes until the vegetables are slightly tender but still crisp.

6. Combine Chicken and Vegetables: Return the cooked chicken to the pan. Sprinkle the remaining black pepper over the chicken and vegetables. Stir well to combine.

7. Add Sesame Oil: Drizzle the sesame oil into the pan and mix everything to ensure all elements are evenly coated with the sauce.

8. Season: Taste and adjust seasoning with salt or additional black pepper if desired.

9. Garnish: Remove from heat and garnish with chopped green onions.

10. Serve: Transfer to a serving dish and enjoy immediately!