1.Prepare the chicken: In a bowl, season the chicken with salt and pepper.

2.Make the sauce: In a separate bowl, whisk together the soy sauce, water, cornstarch, brown sugar, and sesame oil.

3.Stir-fry: Heat the oil in a large skillet or wok over medium-high heat. Add the chicken and cook until browned and fully cooked. Remove from the pan and set aside.

4.Add vegetables: Add the onion and garlic to the skillet and cook until softened. Add the cabbage and stir-fry for 2-3 minutes until it starts to wilt.

5.Combine: Return the chicken to the pan. Pour in the sauce and cook until it thickens and coats the chicken and vegetables.