Cook rice and steam broccoli.
Season chicken pieces with salt and pepper and place in a large nonstick skillet.
Cook until done, stirring often.
In a small bowl or a measuring cup, combine brown sugar, soy sauce, ginger, vinegar and cornstarch. Whisk together until there are no cornstarch lumps left. Add the sauce to chicken and stir constantly, until the sauce starts to thicken into a shiny glaze.
Remove from heat and serve immediately with rice and steamed broccoli.