Making Black Pepper Chicken with Mushrooms is straightforward if you follow these simple steps:

1. Prepare the Chicken: Cut the chicken breasts into bite-sized pieces and season lightly with salt and half of the black pepper.

2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.

3. Cook the Chicken: Add the chicken to the heated oil and sauté for about 5-7 minutes or until browned and cooked through. Remove from the skillet and set aside.

4. Sauté Aromatics: In the same skillet, add sliced onions and minced garlic. Sauté for 2-3 minutes until fragrant.

5. Add Mushrooms: Stir in the sliced mushrooms and cook for another 5 minutes until they begin to soften.

6. Combine Ingredients: Return the cooked chicken to the skillet. Add soy sauce, oyster sauce (if using), sugar, and chicken broth. Mix well.

7. Thicken the Sauce: Bring the mixture to a gentle boil. Then, add the cornstarch slurry to thicken the sauce, stirring continuously until it reaches your desired consistency.

8. Season to Taste: Adjust the seasoning by adding the remaining black pepper and salt if necessary.

9. Garnish: Once everything is well combined, remove from heat and garnish with chopped green onions.

10. Serve Promptly: Serve hot over rice or noodles, allowing the flavors to shine through.

Following these steps ensures that your Black Pepper Chicken with Mushrooms comes out perfectly every time, offering an incredible culinary experience.