Creating this amazing Black Pepper Chicken dish is straightforward when following these steps:

1. Marinate the Chicken: In a bowl, combine the sliced chicken, black pepper, soy sauce, oyster sauce, and cornstarch. Mix well and let it marinate for 10-15 minutes.
2. Prep the Vegetables: While the chicken marinates, slice the bell pepper and onion. Mince the garlic and grate the ginger.
3. Heat the Oil: In a large skillet, heat the vegetable oil over medium-high heat.
4. Cook the Chicken: Add the marinated chicken to the skillet. Stir-fry for about 5-7 minutes or until the chicken is cooked through and slightly browned.
5. Add Vegetables: Incorporate the garlic, ginger, onion, and bell pepper into the skillet. Continue stir-frying for another 5 minutes until the vegetables soften.
6. Adjust Seasoning: Taste and add salt if necessary. If you’d like more heat, consider adding additional black pepper at this stage.
7. Garnish: Turn off the heat and sprinkle chopped green onions over the dish just before serving.

By following these steps, you’ll have a deliciously spicy, savory dish full of delightful textures!