In a ziplock bag add the chicken and cornstarch and shake to coat. In a large skillet or wok over medium high heat, add the olive oil. Working in batches add the chicken and fry each side until golden.
In a small bowl whisk together the chicken broth, brown sugar, soy sauce, hoisin sauce, sesame oil, and cornstarch. Pour over the chicken and cook for 2-3 minutes until sauce starts to thicken. Serve with sesame seeds and green onions.