In a small bowl, mix the low-sodium soy sauce, oyster sauce, cornstarch, and water until smooth. Set aside.
Heat olive oil in a large nonstick pan or wok over medium-high heat. Add the thinly sliced chicken breast and cook for 4–5 minutes, stirring often, until the chicken is fully cooked and lightly golden.
Add the minced garlic and grated fresh ginger to the pan. Stir and cook for about 30 seconds until fragrant.
Add the broccoli florets, sliced bell peppers, and thinly sliced carrots. Stir-fry for 3–4 minutes until the vegetables are tender-crisp.
Sprinkle in the black pepper and a small amount of salt. Stir well to combine.
Pour the prepared sauce into the pan. Stir continuously for 1–2 minutes as the sauce thickens and coats the chicken and vegetables.
Add the chopped spring onions and stir for 30 seconds.
Remove from heat and serve immediately while hot. Enjoy your healthy, low-fat chicken stir fry.