Step-by-Step Instructions
Prepare the protein:
Cut chicken breasts against the grain into uniform bite-sized pieces, about 1-inch cubes, to ensure even cooking. Pat the pieces dry with paper towels to promote better browning when they hit the pan. This step is crucial for texture and helps the sauce adhere better later.
Create the sauce mixture:
Combine oyster sauce, soy sauce, black pepper, cornstarch, salt, and water in a bowl. Whisk thoroughly until the cornstarch is completely dissolved with no lumps remaining. This creates the silky sauce that will coat every piece of chicken and vegetable. Let the mixture sit while you prepare the other ingredients to allow flavors to meld.
Brown the chicken:
Heat vegetable oil in a large wok or skillet over medium-high heat until shimmering. Add chicken pieces in a single layer without overcrowding the pan. Allow them to cook undisturbed for 2 minutes before stirring to develop a beautiful golden crust. Continue cooking for another 3–5 minutes, until chicken is nearly cooked through but still slightly pink in the center.
Cook the aromatics and vegetables:
Add sliced onions to the pan with chicken and sauté for 1 minute until they begin to soften. Add minced garlic and cook for 30 seconds until fragrant, being careful not to burn it. Introduce mushrooms and green pepper next, cooking for another 2–3 minutes until vegetables have softened but still maintain some crispness. The mushrooms will release moisture that helps deglaze the pan, incorporating all the flavorful bits from the chicken.
Thicken with sauce:
Give your sauce mixture one final whisk, then pour it over the chicken and vegetable mixture. Stir continuously as the sauce comes to a simmer and begins to thicken, about 2–3 minutes. You'll notice it transform from watery to glossy as the cornstarch activates with heat. Make sure to coat all ingredients evenly.
Finish with aromatic oil:
Remove the pan from heat and drizzle sesame oil over the dish. Stir gently to incorporate this finishing touch, which adds an aromatic nutty dimension that elevates the entire dish. Let it rest for 1 minute before serving to allow flavors to settle.
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