01 -
Slice the chicken breasts into thin strips. In a bowl, combine the chicken with cornstarch, salt, and black pepper. Toss until the chicken is evenly coated.
02 -
Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Add the chicken and cook until browned on all sides and cooked through, about 5-7 minutes. Remove the chicken from the skillet and set aside.
03 -
Add the remaining vegetable oil to the skillet and add the onion and mushrooms. Cook until the vegetables are softened, about 5 minutes.
04 -
Add the garlic, soy sauce, oyster sauce, sesame oil, and water to the skillet. Stir to combine and bring to a simmer.
05 -
Let the sauce simmer for a few minutes until it thickens slightly.
06 -
Return the chicken to the skillet and stir to combine with the sauce and vegetables.
07 -
Add freshly ground black pepper to taste.
08 -
Garnish with green onions if desired and serve hot with rice or noodles.