Creating Black Pepper Chicken is straightforward if you follow these steps:

1. Prepare the Chicken: Thinly slice the boneless chicken breasts into strips. Pat them dry and season with salt and black pepper.
2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
3. Cook the Chicken: Add the sliced chicken to the skillet in a single layer. Sear for 4-5 minutes until the chicken is browned on one side. Flip and cook for another 3-4 minutes until fully cooked. Remove from the skillet and set aside.
4. Sauté the Vegetables: In the same skillet, add the sliced onion, bell pepper, and broccoli florets. Stir-fry for about 4-5 minutes until the vegetables are tender-crisp.
5. Add Aromatics: Stir in the minced garlic and ginger. Cook for an additional 1-2 minutes until fragrant.
6. Combine Ingredients: Return the cooked chicken to the skillet with the vegetables. Pour in soy sauce and oyster sauce, stirring to coat everything evenly.
7. Thicken the Sauce: In a small bowl, mix cornstarch with a splash of water to create a slurry. Pour this into the skillet and stir constantly until the sauce thickens, about 2 minutes.
8. Adjust Seasoning: Taste and adjust the seasoning. Add more black pepper if desired for extra kick.
9. Garnish and Serve: Remove from heat. Sprinkle chopped green onions on top before serving.

These steps will help you create a delectable Black Pepper Chicken that is bursting with flavor!