Enjoy preparing your Black Pepper Chicken by following these simple steps:

1. Marinate the Chicken: In a bowl, combine the chicken pieces, soy sauce, ground black pepper, and optional sugar. Let it marinate for about 10 minutes.
2. Prepare the Vegetables: While the chicken marinates, slice the bell peppers and mince the garlic and ginger.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Cook the Chicken: Add the marinated chicken to the heated oil. Cook until browned and cooked through, approximately 5-7 minutes. Stir occasionally to ensure even cooking.
5. Add Garlic and Ginger: Once the chicken is nearly done, add the minced garlic and ginger. Stir for about 1 minute until fragrant.
6. Add Veggies: Toss in the sliced bell peppers and stir-fry for 3-4 minutes until they are tender-crisp.
7. Thicken the Sauce: In a small bowl, mix cornstarch with a bit of cold water to create a slurry. Pour this into the pan, stirring well to combine. Cook until the sauce thickens, about 1-2 minutes.
8. Garnish and Serve: Remove from heat, sprinkle with sliced green onions and sesame seeds, if desired.

These steps will guide you seamlessly through making your own Black Pepper Chicken, filling your kitchen with enticing aromas!