Begin by preparing your ingredients. Cut the chicken breast into bite-sized pieces, chop the broccoli into florets, and mince the garlic and ginger.

In a mixing bowl, combine the chopped chicken, soy sauce, cornstarch, minced garlic, and ginger. Toss until the chicken is well-coated and let it sit for 10-15 minutes.

Heat a large pan or wok over medium-high heat and add vegetable oil. Once hot, add the marinated chicken in a single layer and stir-fry for 5-7 minutes.

Add the chopped broccoli to the pan and splash in a small amount of water. Stir-fry for an additional 3-5 minutes until the broccoli is bright green and tender.

Adjust seasoning as necessary and ensure the sauce reaches desired thickness, adding more cornstarch mixed with water if needed. Serve warm over steamed rice.