In a small bowl, combine the soy sauce, brown sugar, garlic, and ginger.
Add the chicken to a bag and pour the marinade all over. Seal and refrigerate for at least 15 minutes.
Heat 1 tablespoon of oil in a large skillet over medium-high heat. Add half the chicken and cook for 4-5 minutes until cooked through. Remove to a plate and repeat with the remaining chicken.
Divide the rice, chicken, and steamed broccoli between 2 bowls. Season with sesame seeds and green onions, and enjoy!